diff --git a/app/access_controls/access_controls.php b/app/access_controls/access_controls.php
index feadcdc5ad..ff391c5604 100644
--- a/app/access_controls/access_controls.php
+++ b/app/access_controls/access_controls.php
@@ -96,7 +96,7 @@
 		}
 
 		//redirect the user
-		header('Location: access_controls.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: access_controls.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
@@ -152,7 +152,7 @@
 	echo "<div class='action_bar' id='action_bar'>\n";
 	echo "	<div class='heading'><b>".$text['title-access_controls']."</b><div class='count'>".number_format($num_rows)."</div></div>\n";
 	echo "	<div class='actions'>\n";
-	echo button::create(['label'=>$text['button-reload'],'icon'=>$settings->get('theme', 'button_icon_reload'),'type'=>'button','id'=>'button_reload','link'=>'access_controls_reload.php'.(!empty($search) ? '?search='.urlencode($search) : null),'style'=>'margin-right: 15px;']);
+	echo button::create(['label'=>$text['button-reload'],'icon'=>$settings->get('theme', 'button_icon_reload'),'type'=>'button','id'=>'button_reload','link'=>'access_controls_reload.php'.(!empty($search) ? '?search='.urlencode($search) : ''),'style'=>'margin-right: 15px;']);
 	if (permission_exists('access_control_add')) {
 		echo button::create(['type'=>'button','label'=>$text['button-add'],'icon'=>$settings->get('theme', 'button_icon_add'),'id'=>'btn_add','name'=>'btn_add','link'=>'access_control_edit.php']);
 	}
diff --git a/app/bridges/bridges.php b/app/bridges/bridges.php
index 2f8c703d6a..482d7366e4 100644
--- a/app/bridges/bridges.php
+++ b/app/bridges/bridges.php
@@ -52,7 +52,7 @@
 //get the http post data
 	if (!empty($_POST['bridges'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$bridges = $_POST['bridges'];
 	}
 
@@ -79,7 +79,7 @@
 				break;
 		}
 
-		header('Location: bridges.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: bridges.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/call_block/call_block.php b/app/call_block/call_block.php
index 45adfee875..418516a320 100644
--- a/app/call_block/call_block.php
+++ b/app/call_block/call_block.php
@@ -51,7 +51,7 @@
 //get posted data
 	if (!empty($_POST['call_blocks'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$call_blocks = $_POST['call_blocks'];
 	}
 
@@ -78,7 +78,7 @@
 				break;
 		}
 
-		header('Location: call_block.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: call_block.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/call_broadcast/call_broadcast.php b/app/call_broadcast/call_broadcast.php
index 4842180a08..b79529b692 100644
--- a/app/call_broadcast/call_broadcast.php
+++ b/app/call_broadcast/call_broadcast.php
@@ -52,7 +52,7 @@
 //get posted data
 	if (!empty($_POST['call_broadcasts'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$call_broadcasts = $_POST['call_broadcasts'];
 	}
 
@@ -73,7 +73,7 @@
 				break;
 		}
 
-		header('Location: call_broadcast.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: call_broadcast.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/call_centers/call_center_agents.php b/app/call_centers/call_center_agents.php
index ec536694e2..5c9b73bd1a 100644
--- a/app/call_centers/call_center_agents.php
+++ b/app/call_centers/call_center_agents.php
@@ -48,7 +48,7 @@
 //get posted data
 	if (!empty($_POST['call_center_agents'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$call_center_agents = $_POST['call_center_agents'];
 	}
 
@@ -63,7 +63,7 @@
 				break;
 		}
 
-		header('Location: call_center_agents.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: call_center_agents.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/call_centers/call_center_queues.php b/app/call_centers/call_center_queues.php
index b3d19fe446..f5a6525b01 100644
--- a/app/call_centers/call_center_queues.php
+++ b/app/call_centers/call_center_queues.php
@@ -51,7 +51,7 @@
 //get posted data
 	if (!empty($_POST['call_center_queues']) && is_array($_POST['call_center_queues'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$call_center_queues = $_POST['call_center_queues'];
 	}
 
@@ -72,7 +72,7 @@
 				break;
 		}
 
-		header('Location: call_center_queues.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: call_center_queues.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/call_flows/call_flows.php b/app/call_flows/call_flows.php
index eb43308464..9e6b25cbfb 100644
--- a/app/call_flows/call_flows.php
+++ b/app/call_flows/call_flows.php
@@ -49,7 +49,7 @@
 	$list_row_edit_button = $settings->get('theme', 'list_row_edit_button', false);
 
 //get search
-	$search = $_REQUEST['search'] ?? null;
+	$search = $_REQUEST['search'] ?? '';
 
 //get posted data
 	if (!empty($_POST['call_flows'])) {
@@ -82,7 +82,7 @@
 				break;
 		}
 
-		header('Location: call_flows.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: call_flows.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/call_recordings/call_recordings.php b/app/call_recordings/call_recordings.php
index 432fd28904..72d9b1341e 100644
--- a/app/call_recordings/call_recordings.php
+++ b/app/call_recordings/call_recordings.php
@@ -55,7 +55,7 @@
 //get the http post data
 	if (!empty($_POST['call_recordings']) && is_array($_POST['call_recordings'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$call_recordings = $_POST['call_recordings'];
 	}
 
@@ -83,7 +83,7 @@
 		}
 
 		//redirect the user
-		header('Location: call_recordings.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: call_recordings.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/conference_centers/conference_centers.php b/app/conference_centers/conference_centers.php
index 8287521693..4e5760368d 100644
--- a/app/conference_centers/conference_centers.php
+++ b/app/conference_centers/conference_centers.php
@@ -51,7 +51,7 @@
 //get posted data
 	if (!empty($_POST['conference_centers'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$conference_centers = $_POST['conference_centers'];
 	}
 
@@ -80,7 +80,7 @@
 				break;
 		}
 
-		header('Location: conference_centers.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: conference_centers.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/conference_centers/conference_rooms.php b/app/conference_centers/conference_rooms.php
index b1af9859d6..1636d31033 100644
--- a/app/conference_centers/conference_rooms.php
+++ b/app/conference_centers/conference_rooms.php
@@ -52,7 +52,7 @@
 	if (!empty($_POST['conference_rooms'])) {
 		$action = $_POST['action'];
 		$toggle_field = $_POST['toggle_field'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$conference_rooms = $_POST['conference_rooms'];
 	}
 
@@ -74,7 +74,7 @@
 				break;
 		}
 
-		header('Location: conference_rooms.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: conference_rooms.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/conference_controls/conference_controls.php b/app/conference_controls/conference_controls.php
index 4a6add57c6..5afb27bc2d 100644
--- a/app/conference_controls/conference_controls.php
+++ b/app/conference_controls/conference_controls.php
@@ -48,7 +48,7 @@
 //get the http post data
 	if (!empty($_POST['conference_controls'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$conference_controls = $_POST['conference_controls'];
 	}
 
@@ -75,7 +75,7 @@
 				break;
 		}
 
-		header('Location: conference_controls.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: conference_controls.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/conference_profiles/conference_profiles.php b/app/conference_profiles/conference_profiles.php
index bd7eb83509..b51b1997fe 100644
--- a/app/conference_profiles/conference_profiles.php
+++ b/app/conference_profiles/conference_profiles.php
@@ -50,7 +50,7 @@
 //get the http post data
 	if (!empty($_POST['conference_profiles'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$conference_profiles = $_POST['conference_profiles'];
 	}
 
@@ -77,7 +77,7 @@
 				break;
 		}
 
-		header('Location: conference_profiles.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: conference_profiles.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/conferences/conferences.php b/app/conferences/conferences.php
index 40e0369508..69549b2080 100644
--- a/app/conferences/conferences.php
+++ b/app/conferences/conferences.php
@@ -51,7 +51,7 @@
 //get posted data
 	if (!empty($_POST['conferences'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$conferences = $_POST['conferences'];
 	}
 
@@ -78,7 +78,7 @@
 				break;
 		}
 
-		header('Location: conferences.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: conferences.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/destinations/destinations.php b/app/destinations/destinations.php
index 2d8916b64e..35e093d17d 100644
--- a/app/destinations/destinations.php
+++ b/app/destinations/destinations.php
@@ -79,7 +79,7 @@
 				break;
 		}
 
-		header('Location: destinations.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: destinations.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/devices/device_profiles.php b/app/devices/device_profiles.php
index 319f26bd7e..6274c0afc9 100644
--- a/app/devices/device_profiles.php
+++ b/app/devices/device_profiles.php
@@ -44,7 +44,7 @@
 //get posted data
 	if (!empty($_POST['profiles']) && is_array($_POST['profiles'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$profiles = $_POST['profiles'];
 	}
 
diff --git a/app/devices/device_vendors.php b/app/devices/device_vendors.php
index 84c67a0e5f..3bb5f0a12b 100644
--- a/app/devices/device_vendors.php
+++ b/app/devices/device_vendors.php
@@ -45,7 +45,7 @@
 //get posted data
 	if (!empty($_POST['vendors']) && is_array($_POST['vendors'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$vendors = $_POST['vendors'];
 	}
 
@@ -66,7 +66,7 @@
 				break;
 		}
 
-		header('Location: device_vendors.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: device_vendors.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/dialplans/dialplans.php b/app/dialplans/dialplans.php
index 324122d451..2ac3c4a626 100644
--- a/app/dialplans/dialplans.php
+++ b/app/dialplans/dialplans.php
@@ -60,7 +60,7 @@
 		$action = $_POST['action'];
 		$dialplans = $_POST['dialplans'];
 		$context = $_POST['context'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$order_by = $_POST['order_by'];
 		$order = $_POST['order'];
 	}
diff --git a/app/email_queue/email_queue.php b/app/email_queue/email_queue.php
index ef801f3335..caa3393e6b 100644
--- a/app/email_queue/email_queue.php
+++ b/app/email_queue/email_queue.php
@@ -45,7 +45,7 @@
 //get the http post data
 	if (!empty($_POST['email_queue']) && is_array($_POST['email_queue'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$email_queue = $_POST['email_queue'];
 	}
 
@@ -90,7 +90,7 @@
 		}
 
 		//redirect the user
-		header('Location: email_queue.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: email_queue.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/emergency/emergency.php b/app/emergency/emergency.php
index 9c29a82642..670a66a01a 100644
--- a/app/emergency/emergency.php
+++ b/app/emergency/emergency.php
@@ -21,7 +21,7 @@ $text = $language->get();
 //get the http post data
 if (!empty($_POST['emergency_logs']) && is_array($_POST['emergency_logs'])) {
 	$action = $_POST['action'];
-	$search = $_POST['search'];
+	$search = $_POST['search'] ?? '';
 	$emergency_logs = $_POST['emergency_logs'];
 }
 
@@ -59,7 +59,7 @@ if (!empty($action) && !empty($emergency_logs) && is_array($emergency_logs) && @
 	}
 
 	//redirect the user
-	header('Location: emergency.php'.($search != '' ? '?search='.urlencode($search) : null));
+	header('Location: emergency.php'.($search != '' ? '?search='.urlencode($search) : ''));
 	exit;
 }
 
diff --git a/app/event_guard/event_guard_logs.php b/app/event_guard/event_guard_logs.php
index e3db39e08f..69c2d81979 100644
--- a/app/event_guard/event_guard_logs.php
+++ b/app/event_guard/event_guard_logs.php
@@ -44,7 +44,7 @@
 //get the http post data
 	if (!empty($_POST['event_guard_logs']) && is_array($_POST['event_guard_logs'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$event_guard_logs = $_POST['event_guard_logs'];
 	}
 
@@ -73,7 +73,7 @@
 		}
 
 		//redirect the user
-		header('Location: event_guard_logs.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: event_guard_logs.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/extension_settings/extension_settings.php b/app/extension_settings/extension_settings.php
index 0c8361e3ea..af79e29322 100644
--- a/app/extension_settings/extension_settings.php
+++ b/app/extension_settings/extension_settings.php
@@ -49,7 +49,7 @@
 //get the http post data
 	if (!empty($_POST['extension_settings'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$extension_settings = $_POST['extension_settings'];
 	}
 
@@ -93,7 +93,7 @@
 		}
 
 		//redirect the user
-		header('Location: extension_settings.php?id='.urlencode($extension_uuid).'&'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: extension_settings.php?id='.urlencode($extension_uuid).'&'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/extensions/extensions.php b/app/extensions/extensions.php
index f7de4caff0..f5e36269b6 100644
--- a/app/extensions/extensions.php
+++ b/app/extensions/extensions.php
@@ -52,7 +52,7 @@
 //get posted data
 	if (!empty($_POST['extensions']) && is_array($_POST['extensions'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$extensions = $_POST['extensions'];
 	}
 
@@ -77,7 +77,7 @@
 				break;
 		}
 
-		header('Location: extensions.php?'.(!empty($order_by) ? '&order_by='.$order_by.'&order='.$order : null).(is_numeric($page) ? '&page='.urlencode($page) : null).($search != '' ? '&search='.urlencode($search) : null));
+		header('Location: extensions.php?'.(!empty($order_by) ? '&order_by='.$order_by.'&order='.$order : null).(is_numeric($page) ? '&page='.urlencode($page) : null).($search != '' ? '&search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/fax/fax.php b/app/fax/fax.php
index 73e747f566..932bb071f0 100644
--- a/app/fax/fax.php
+++ b/app/fax/fax.php
@@ -45,7 +45,7 @@
 //get posted data
 	if (!empty($_POST['fax_servers']) && is_array($_POST['fax_servers'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$fax_servers = $_POST['fax_servers'];
 	}
 
@@ -66,7 +66,7 @@
 				break;
 		}
 
-		header('Location: fax.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: fax.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/fifo/fifo.php b/app/fifo/fifo.php
index a55f46b6c2..8a1cfabb8d 100644
--- a/app/fifo/fifo.php
+++ b/app/fifo/fifo.php
@@ -48,7 +48,7 @@
 //get the http post data
 	if (!empty($_POST['fifo']) && is_array($_POST['fifo'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$fifo = $_POST['fifo'];
 	}
 
@@ -86,7 +86,7 @@
 		}
 
 		//redirect the user
-		header('Location: fifo.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: fifo.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/gateways/gateways.php b/app/gateways/gateways.php
index a71d3aee72..56466766f6 100644
--- a/app/gateways/gateways.php
+++ b/app/gateways/gateways.php
@@ -85,7 +85,7 @@
 				break;
 		}
 
-		header('Location: gateways.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: gateways.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/ivr_menus/ivr_menus.php b/app/ivr_menus/ivr_menus.php
index b748cfffd7..539992c118 100644
--- a/app/ivr_menus/ivr_menus.php
+++ b/app/ivr_menus/ivr_menus.php
@@ -50,7 +50,7 @@
 //get posted data
 	if (!empty($_POST['ivr_menus'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$ivr_menus = $_POST['ivr_menus'];
 	}
 
@@ -77,7 +77,7 @@
 				break;
 		}
 
-		header('Location: ivr_menus.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: ivr_menus.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/modules/modules.php b/app/modules/modules.php
index 5812d20802..f29d760cdb 100644
--- a/app/modules/modules.php
+++ b/app/modules/modules.php
@@ -56,7 +56,7 @@
 		$action = $_POST['action'];
 	}
 	if (!empty($_POST['search'])) {
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 	}
 
 //set from session variables
@@ -93,7 +93,7 @@
 		}
 
 		//redirect to display updates
-		header('Location: modules.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: modules.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/number_translations/number_translations.php b/app/number_translations/number_translations.php
index b400108878..7e4f5fa842 100644
--- a/app/number_translations/number_translations.php
+++ b/app/number_translations/number_translations.php
@@ -51,7 +51,7 @@
 //get the http post data
 	if (!empty($_POST['number_translations'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$number_translations = $_POST['number_translations'];
 	}
 
@@ -95,7 +95,7 @@
 		}
 
 		//redirect the user
-		header('Location: number_translations.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: number_translations.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/phrases/phrases.php b/app/phrases/phrases.php
index 375cc95deb..34786d66bc 100644
--- a/app/phrases/phrases.php
+++ b/app/phrases/phrases.php
@@ -48,7 +48,7 @@
 //get posted data
 	if (!empty($_POST['phrases'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$phrases = $_POST['phrases'];
 	}
 
@@ -78,7 +78,7 @@
 				break;
 		}
 
-		header('Location: phrases.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: phrases.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/pin_numbers/pin_numbers.php b/app/pin_numbers/pin_numbers.php
index d17daa5bd6..eab968178b 100644
--- a/app/pin_numbers/pin_numbers.php
+++ b/app/pin_numbers/pin_numbers.php
@@ -45,7 +45,7 @@
 //get posted data
 	if (is_array($_POST['pin_numbers'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$pin_numbers = $_POST['pin_numbers'];
 	}
 
@@ -72,7 +72,7 @@
 				break;
 		}
 
-		header('Location: pin_numbers.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: pin_numbers.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/recordings/recordings.php b/app/recordings/recordings.php
index 3c61ed017d..4f20cc8bf6 100644
--- a/app/recordings/recordings.php
+++ b/app/recordings/recordings.php
@@ -295,7 +295,7 @@
 				break;
 		}
 
-		header('Location: recordings.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: recordings.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/registrations/registrations.php b/app/registrations/registrations.php
index def116880f..804f37d93d 100644
--- a/app/registrations/registrations.php
+++ b/app/registrations/registrations.php
@@ -45,7 +45,7 @@
 //get common submitted data
 	if (!empty($_REQUEST)) {
 		$show = $_REQUEST['show'] ?? null;
-		$search = $_REQUEST['search'] ?? null;
+		$search = $_REQUEST['search'] ?? '';
 		$profile = $_REQUEST['profile'] ?? null;
 	}
 
diff --git a/app/ring_groups/ring_groups.php b/app/ring_groups/ring_groups.php
index 22b935dbcc..adb85dcd43 100644
--- a/app/ring_groups/ring_groups.php
+++ b/app/ring_groups/ring_groups.php
@@ -52,7 +52,7 @@
 //get posted data
 	if (!empty($_POST['ring_groups'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$ring_groups = $_POST['ring_groups'];
 	}
 
@@ -73,7 +73,7 @@
 				break;
 		}
 
-		header('Location: ring_groups.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: ring_groups.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/sip_profiles/sip_profiles.php b/app/sip_profiles/sip_profiles.php
index e21d63b9b4..cc70dc33e4 100644
--- a/app/sip_profiles/sip_profiles.php
+++ b/app/sip_profiles/sip_profiles.php
@@ -50,7 +50,7 @@
 //get the http post data
 	if (!empty($_POST['sip_profiles'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$sip_profiles = $_POST['sip_profiles'];
 	}
 
@@ -71,7 +71,7 @@
 				break;
 		}
 
-		header('Location: sip_profiles.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: sip_profiles.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/sofia_global_settings/sofia_global_settings.php b/app/sofia_global_settings/sofia_global_settings.php
index 8ca302929a..6ee351a7cb 100644
--- a/app/sofia_global_settings/sofia_global_settings.php
+++ b/app/sofia_global_settings/sofia_global_settings.php
@@ -49,7 +49,7 @@
 //get the http post data
 	if (!empty($_POST['sofia_global_settings'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$sofia_global_settings = $_POST['sofia_global_settings'];
 	}
 
@@ -78,7 +78,7 @@
 		}
 
 		//redirect the user
-		header('Location: sofia_global_settings.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: sofia_global_settings.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/streams/streams.php b/app/streams/streams.php
index 813c25bd46..f07ac7c751 100644
--- a/app/streams/streams.php
+++ b/app/streams/streams.php
@@ -48,7 +48,7 @@
 //get the http post data
 	if (!empty($_POST['streams'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$streams = $_POST['streams'];
 	}
 
@@ -75,7 +75,7 @@
 				break;
 		}
 
-		header('Location: streams.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: streams.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/time_conditions/time_conditions.php b/app/time_conditions/time_conditions.php
index a239b1469a..982119d6dc 100644
--- a/app/time_conditions/time_conditions.php
+++ b/app/time_conditions/time_conditions.php
@@ -45,7 +45,7 @@
 //get the http post data
 	if (!empty($_POST['time_conditions']) && is_array($_POST['time_conditions'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$time_conditions = $_POST['time_conditions'];
 	}
 
@@ -72,7 +72,7 @@
 				break;
 		}
 
-		header('Location: time_conditions.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: time_conditions.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/vars/vars.php b/app/vars/vars.php
index e7506894a4..11bf09091b 100644
--- a/app/vars/vars.php
+++ b/app/vars/vars.php
@@ -76,7 +76,7 @@
 				break;
 		}
 
-		header('Location: vars.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: vars.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/app/voicemails/voicemails.php b/app/voicemails/voicemails.php
index c672279793..0776f37e41 100644
--- a/app/voicemails/voicemails.php
+++ b/app/voicemails/voicemails.php
@@ -70,7 +70,7 @@
 				break;
 		}
 
-		header('Location: voicemails.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: voicemails.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/contacts/contacts.php b/core/contacts/contacts.php
index 8bb2e485bc..574b277560 100644
--- a/core/contacts/contacts.php
+++ b/core/contacts/contacts.php
@@ -51,7 +51,7 @@
 //get posted data
 	if (!empty($_POST['contacts'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$contacts = $_POST['contacts'];
 	}
 
@@ -66,7 +66,7 @@
 				break;
 		}
 
-		header('Location: contacts.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: contacts.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/dashboard/dashboard.php b/core/dashboard/dashboard.php
index f52d1d8b17..053f182fb3 100644
--- a/core/dashboard/dashboard.php
+++ b/core/dashboard/dashboard.php
@@ -45,7 +45,7 @@
 //get the http post data
 	if (!empty($_POST['dashboards'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$dashboards = $_POST['dashboards'];
 	}
 
@@ -73,7 +73,7 @@
 		}
 
 		//redirect the user
-		header('Location: dashboard.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: dashboard.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/default_settings/default_setting_edit.php b/core/default_settings/default_setting_edit.php
index d6aad054c0..f68b63ab52 100644
--- a/core/default_settings/default_setting_edit.php
+++ b/core/default_settings/default_setting_edit.php
@@ -62,7 +62,7 @@
 
 //get the search variable
 	if (!empty($_REQUEST['search'])) {
-		$search = $_REQUEST['search'];
+		$search = $_REQUEST['search'] ?? '';
 	}
 
 //get http post variables and set them to php variables
diff --git a/core/default_settings/default_setting_toggle.php b/core/default_settings/default_setting_toggle.php
index 9dbc71bb7e..287d7a8ecf 100644
--- a/core/default_settings/default_setting_toggle.php
+++ b/core/default_settings/default_setting_toggle.php
@@ -42,7 +42,7 @@
 	$text = $language->get();
 
 //get submitted variables
-	$search = $_REQUEST['search'];
+	$search = $_REQUEST['search'] ?? '';
 	$default_setting_uuids = $_REQUEST["id"];
 
 //toggle the setting
diff --git a/core/default_settings/default_settings.php b/core/default_settings/default_settings.php
index cc779ff59e..f1d17e4451 100644
--- a/core/default_settings/default_settings.php
+++ b/core/default_settings/default_settings.php
@@ -301,7 +301,7 @@
 	echo "	<div class='heading'><b>".$text['title-default_settings']."</b><div class='count'>".number_format($num_rows)."</div></div>\n";
 	echo "	<div class='actions'>\n";
 	echo button::create(['type'=>'button','label'=>$text['label-domain'],'icon'=>$settings->get('theme', 'button_icon_domain'),'style'=>'','link'=>PROJECT_PATH.'/core/domain_settings/domain_settings.php?id='.$domain_uuid]);
-	echo button::create(['label'=>$text['button-reload'],'icon'=>$settings->get('theme', 'button_icon_reload'),'type'=>'button','id'=>'button_reload','link'=>'default_settings_reload.php'.(!empty($search) ? '?search='.urlencode($search) : null),'style'=>'margin-right: 15px;']);
+	echo button::create(['label'=>$text['button-reload'],'icon'=>$settings->get('theme', 'button_icon_reload'),'type'=>'button','id'=>'button_reload','link'=>'default_settings_reload.php'.(!empty($search) ? '?search='.urlencode($search) : ''),'style'=>'margin-right: 15px;']);
 	if ($permission['default_setting_add']) {
 		echo button::create(['type'=>'button','label'=>$text['button-add'],'icon'=>$settings->get('theme', 'button_icon_add'),'id'=>'btn_add','link'=>'default_setting_edit.php?'.$query_string]);
 	}
diff --git a/core/domains/domain_json.php b/core/domains/domain_json.php
index 1ef0def1c6..0b13473989 100644
--- a/core/domains/domain_json.php
+++ b/core/domains/domain_json.php
@@ -39,7 +39,7 @@
 
 //get posted data
 	if (!empty($_POST['search'])) {
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 	}
 
 //add the search term
diff --git a/core/domains/domains.php b/core/domains/domains.php
index 1702b433c1..68562b408b 100644
--- a/core/domains/domains.php
+++ b/core/domains/domains.php
@@ -139,7 +139,7 @@
 				break;
 		}
 
-		header('Location: domains.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: domains.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/email_templates/email_templates.php b/core/email_templates/email_templates.php
index afa8e6b6e6..fc2d2c0927 100644
--- a/core/email_templates/email_templates.php
+++ b/core/email_templates/email_templates.php
@@ -46,7 +46,7 @@
 	if (!empty($_POST['email_templates'])) {
 		$action = $_POST['action'];
 		$category = $_POST['category'] ?? null;
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$email_templates = $_POST['email_templates'];
 	}
 
@@ -73,7 +73,7 @@
 				break;
 		}
 
-		header('Location: email_templates.php?'.(!empty($search) ? '&search='.urlencode($search) : null).(!empty($category) ? '&category='.urlencode($category) : null));
+		header('Location: email_templates.php?'.(!empty($search) ? '&search='.urlencode($search) : '').(!empty($category) ? '&category='.urlencode($category) : null));
 		exit;
 	}
 
diff --git a/core/groups/group_permissions.php b/core/groups/group_permissions.php
index a14d96da27..4f38e63e9c 100644
--- a/core/groups/group_permissions.php
+++ b/core/groups/group_permissions.php
@@ -95,7 +95,7 @@
 
 			//set message and redirect
 				message::add($text['message-permissions_reloaded'],'positive');
-				header('Location: group_permissions.php?group_uuid='.urlencode($_GET['group_uuid']).($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : null));
+				header('Location: group_permissions.php?group_uuid='.urlencode($_GET['group_uuid']).($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : ''));
 				exit;
 		}
 	}
@@ -232,7 +232,7 @@
 			$token = new token;
 			if (!$token->validate($_SERVER['PHP_SELF'])) {
 				message::add($text['message-invalid_token'],'negative');
-				header('Location: group_permissions.php?group_uuid='.urlencode($group_uuid).($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : null));
+				header('Location: group_permissions.php?group_uuid='.urlencode($group_uuid).($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : ''));
 				exit;
 			}
 
@@ -253,7 +253,7 @@
 			message::add($text['message-update']);
 
 		//redirect
-			header('Location: group_permissions.php?group_uuid='.urlencode($group_uuid).($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : null));
+			header('Location: group_permissions.php?group_uuid='.urlencode($group_uuid).($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : ''));
 			exit;
 	}
 
@@ -270,7 +270,7 @@
 	echo "	<div class='heading'><b>".$text['title-group_permissions']."</b><div class='count'>".escape($group_name)."</div></div>\n";
 	echo "	<div class='actions'>\n";
 	echo button::create(['type'=>'button','label'=>$text['button-back'],'icon'=>$settings->get('theme', 'button_icon_back'),'id'=>'btn_back','style'=>'margin-right: 15px;','collapse'=>'hide-md-dn','link'=>'groups.php']);
-	echo button::create(['type'=>'button','label'=>$text['button-reload'],'icon'=>$settings->get('theme', 'button_icon_reload'),'collapse'=>'hide-md-dn','link'=>'?group_uuid='.urlencode($group_uuid).'&action=reload'.($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : null)]);
+	echo button::create(['type'=>'button','label'=>$text['button-reload'],'icon'=>$settings->get('theme', 'button_icon_reload'),'collapse'=>'hide-md-dn','link'=>'?group_uuid='.urlencode($group_uuid).'&action=reload'.($view ? '&view='.urlencode($view) : null).($search ? '&search='.urlencode($search) : '')]);
 	if (permission_exists('group_member_view')) {
 		echo button::create(['type'=>'button','label'=>$text['button-members'],'icon'=>'users','collapse'=>'hide-md-dn','link'=>'group_members.php?group_uuid='.urlencode($group_uuid)]);
 	}
diff --git a/core/groups/groups.php b/core/groups/groups.php
index 25860d3c19..cf5dd049a5 100644
--- a/core/groups/groups.php
+++ b/core/groups/groups.php
@@ -71,7 +71,7 @@
 				break;
 		}
 
-		header('Location: groups.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: groups.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/menu/menu.php b/core/menu/menu.php
index 5ba6855029..0686bf20aa 100644
--- a/core/menu/menu.php
+++ b/core/menu/menu.php
@@ -66,7 +66,7 @@
 				break;
 		}
 
-		header('Location: menu.php'.(!empty($search) ? '?search='.urlencode($search) : null));
+		header('Location: menu.php'.(!empty($search) ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/user_logs/user_logs.php b/core/user_logs/user_logs.php
index 5b2d1a75c2..dfae9687f8 100644
--- a/core/user_logs/user_logs.php
+++ b/core/user_logs/user_logs.php
@@ -57,7 +57,7 @@
 //get the http post data
 	if (!empty($_POST['user_logs']) && is_array($_POST['user_logs'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'];
+		$search = $_POST['search'] ?? '';
 		$user_logs = $_POST['user_logs'];
 	}
 
@@ -87,7 +87,7 @@
 		}
 
 		//redirect the user
-		header('Location: user_logs.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: user_logs.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}
 
diff --git a/core/users/users.php b/core/users/users.php
index 83f26c6d9a..473d08e196 100644
--- a/core/users/users.php
+++ b/core/users/users.php
@@ -69,7 +69,7 @@
 				break;
 		}
 
-		header('Location: users.php'.($search != '' ? '?search='.urlencode($search) : null));
+		header('Location: users.php'.($search != '' ? '?search='.urlencode($search) : ''));
 		exit;
 	}