diff --git a/app/call_centers/call_center_queue_edit.php b/app/call_centers/call_center_queue_edit.php
index da8b4af44b..b3f111edae 100644
--- a/app/call_centers/call_center_queue_edit.php
+++ b/app/call_centers/call_center_queue_edit.php
@@ -559,7 +559,7 @@
 
 //add an empty row to the tiers array
 	if (count($tiers) == 0) {
-		$rows = $_SESSION['call_center']['agent_add_rows']['numeric'];
+		$rows = $_SESSION['call_center']['agent_add_rows']['numeric'] ?? null;
 		$id = 0;
 	}
 	if (count($tiers) > 0) {
diff --git a/app/call_centers/call_center_queues.php b/app/call_centers/call_center_queues.php
index fe329e1427..325707b8dc 100644
--- a/app/call_centers/call_center_queues.php
+++ b/app/call_centers/call_center_queues.php
@@ -53,14 +53,14 @@
 	$list_row_edit_button = !empty($_SESSION['theme']['list_row_edit_button']['boolean']) ? $_SESSION['theme']['list_row_edit_button']['boolean'] : 'false';
 
 //get posted data
-	if (!empty($_POST['call_center_queues'])) {
+	if (!empty($_POST['call_center_queues']) && is_array($_POST['call_center_queues'])) {
 		$action = $_POST['action'];
 		$search = $_POST['search'];
 		$call_center_queues = $_POST['call_center_queues'];
 	}
 
 //process the http post data by action
-	if (!empty($action) && !empty($call_center_queues)) {
+	if (!empty($action) && is_array($call_center_queues) && @sizeof($call_center_queues) != 0) {
 		switch ($action) {
 			case 'copy':
 				if (permission_exists('call_center_queue_add')) {
@@ -97,7 +97,7 @@
 //get total call center queues count from the database
 	$sql = "select count(*) from v_call_center_queues ";
 	$sql .= "where true ";
-	if (!empty($_GET['show']) && $_GET['show'] != "all" || !permission_exists('call_center_all')) {
+	if ($show != "all" || !permission_exists('call_center_all')) {
 		$sql .= "and (domain_uuid = :domain_uuid or domain_uuid is null) ";
 		$parameters['domain_uuid'] = $_SESSION['domain_uuid'];
 	}
diff --git a/app/call_forward/call_forward_edit.php b/app/call_forward/call_forward_edit.php
index 5a3e8c89ea..0139155f7c 100644
--- a/app/call_forward/call_forward_edit.php
+++ b/app/call_forward/call_forward_edit.php
@@ -85,7 +85,7 @@
 	$parameters['domain_uuid'] = $_SESSION['domain_uuid'];
 	$parameters['extension_uuid'] = $extension_uuid;
 	$database = new database;
-	$row = $database->select($sql, $parameters ?? null, 'row');
+	$row = $database->select($sql, $parameters, 'row');
 	if (!empty($row)) {
 		$extension = $row["extension"];
 		$number_alias = $row["number_alias"];
@@ -478,7 +478,7 @@
 			$sql .= "order by follow_me_order asc ";
 			$parameters['follow_me_uuid'] = $follow_me_uuid;
 			$database = new database;
-			$result = $database->select($sql, $parameters ?? null, 'all');
+			$result = $database->select($sql, $parameters, 'all');
 
 			unset($destinations);
 			foreach ($result as $x => &$row) {
@@ -507,7 +507,7 @@
 	$sql .= "order by extension, number_alias asc ";
 	$parameters['domain_uuid'] = $_SESSION['domain_uuid'];
 	$database = new database;
-	$extensions = $database->select($sql, $parameters ?? null, 'all');
+	$extensions = $database->select($sql, $parameters, 'all');
 	unset($sql, $parameters, $row);
 
 //set the default
@@ -517,7 +517,7 @@
 	}
 
 //prepare the autocomplete
-	if(!empty($_SESSION['follow_me']['follow_me_autocomplete']['boolean']) == 'true') {
+	if(!empty($_SESSION['follow_me']['follow_me_autocomplete']['boolean']) && $_SESSION['follow_me']['follow_me_autocomplete']['boolean'] == 'true') {
 		echo "<link rel=\"stylesheet\" href=\"".PROJECT_PATH."/resources/jquery/jquery-ui.min.css\" />\n";
 		echo "<script src=\"".PROJECT_PATH."/resources/jquery/jquery-ui.min.js\"></script>\n";
 		echo "<script type=\"text/javascript\">\n";
@@ -754,7 +754,7 @@
 	echo "</table>";
 	echo "<br /><br />";
 
-	if (!empty($action) == "update") {
+	if (!empty($action) && $action == "update") {
 		echo "<input type='hidden' name='id' value='".escape($extension_uuid)."'>\n";
 	}
 	echo "<input type='hidden' name='".$token['name']."' value='".$token['hash']."'>\n";
diff --git a/app/call_recordings/call_recordings.php b/app/call_recordings/call_recordings.php
index 1315019a97..dad52686be 100644
--- a/app/call_recordings/call_recordings.php
+++ b/app/call_recordings/call_recordings.php
@@ -51,14 +51,14 @@
 	$show = $_GET["show"] ?? '';
 
 //get the http post data
-	if (!empty($_POST['call_recordings'])) {
+	if (!empty($_POST['call_recordings']) && is_array($_POST['call_recordings'])) {
 		$action = $_POST['action'];
 		$search = $_POST['search'];
 		$call_recordings = $_POST['call_recordings'];
 	}
 
 //process the http post data by action
-	if (!empty($action) && !empty($call_recordings)) {
+	if (!empty($action) && is_array($call_recordings) && @sizeof($call_recordings) != 0) {
 		switch ($action) {
 			case 'delete':
 				if (permission_exists('call_recording_delete')) {
@@ -148,10 +148,10 @@
 	unset($sql, $parameters);
 
 //count the results
-	$result_count = !empty($call_recordings) ? sizeof($call_recordings) : 0;
+	$result_count = is_array($call_recordings) ? sizeof($call_recordings) : 0;
 
 //limit the number of results
-	if ($_SESSION['cdr']['limit']['numeric'] > 0) {
+	if (!empty($_SESSION['cdr']['limit']['numeric']) && $_SESSION['cdr']['limit']['numeric'] > 0) {
 		$num_rows = $_SESSION['cdr']['limit']['numeric'];
 	}
 
@@ -160,8 +160,8 @@
 	if ($show == "all" && permission_exists('call_recording_all')) {
 		$param .= "&show=all";
 	}
-	list($paging_controls_mini, $rows_per_page) = paging($num_rows, $param, $rows_per_page, true, $result_count); //top
-	list($paging_controls, $rows_per_page) = paging($num_rows, $param, $rows_per_page, false, $result_count); //bottom
+	list($paging_controls_mini, $rows_per_page) = paging($num_rows ?? null, $param, $rows_per_page, true, $result_count); //top
+	list($paging_controls, $rows_per_page) = paging($num_rows ?? null, $param, $rows_per_page, false, $result_count); //bottom
 
 //create token
 	$object = new token;
@@ -187,7 +187,7 @@
 			echo "		<input type='hidden' name='show' value='all'>";
 		}
 		else {
-			echo button::create(['type'=>'button','label'=>$text['button-show_all'],'icon'=>$_SESSION['theme']['button_icon_all'],'link'=>'?type='.urlencode($destination_type ?? '').'&show=all'.($search ? "&search=".urlencode($search) : null)]);
+			echo button::create(['type'=>'button','label'=>$text['button-show_all'],'icon'=>$_SESSION['theme']['button_icon_all'],'link'=>'?type='.urlencode($destination_type ?? '').'&show=all'.(!empty($search) ? "&search=".urlencode($search) : null)]);
 		}
 	}
 	echo 		"<input type='text' class='txt list-search' name='search' id='search' value=\"".escape($search)."\" placeholder=\"".$text['label-search']."\" onkeydown=\"$('#btn_reset').hide(); $('#btn_search').show();\">";
@@ -244,7 +244,7 @@
 	}
 	echo "</tr>\n";
 
-	if (!empty($call_recordings)) {
+	if (is_array($call_recordings) && @sizeof($call_recordings) != 0) {
 		$x = 0;
 		foreach ($call_recordings as $row) {
 			//playback progress bar
@@ -262,7 +262,7 @@
 				echo "		<input type='hidden' name='call_recordings[$x][uuid]' value='".escape($row['call_recording_uuid'])."' />\n";
 				echo "	</td>\n";
 			}
-			if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('call_recording_all')) {
+			if ($show == "all" && permission_exists('call_recording_all')) {
 				echo "	<td class='overflow hide-sm-dn shrink'>".escape($row['domain_name'])."</td>\n";
 			}
 			echo "	<td class='hide-sm-dn shrink'>".escape($row['caller_id_name'])."</td>\n";
diff --git a/app/call_recordings/resources/classes/call_recordings.php b/app/call_recordings/resources/classes/call_recordings.php
index f1725c79d0..8e6f89a7a9 100644
--- a/app/call_recordings/resources/classes/call_recordings.php
+++ b/app/call_recordings/resources/classes/call_recordings.php
@@ -160,15 +160,11 @@ if (!class_exists('call_recordings')) {
 						unset($sql, $parameters, $row);
 					}
 
-				//set the path for the directory
-// 					$default_path = $_SESSION['switch']['call_recordings']['dir']."/".$_SESSION['domain_name'];
-
 				//build full path
 					$full_recording_path = $call_recording_path.'/'.$call_recording_name;
 
 				//download the file
 					if ($full_recording_path != '/' && file_exists($full_recording_path)) {
-// 						ob_clean();
 						$fd = fopen($full_recording_path, "rb");
 						if ($this->binary) {
 							header("Content-Type: application/force-download");
@@ -190,8 +186,8 @@ if (!class_exists('call_recordings')) {
 						if ($this->binary) {
 							header("Content-Length: ".filesize($full_recording_path));
 						}
-// 						ob_clean();
-// 						fpassthru($fd);
+ 						ob_clean();
+ 						fpassthru($fd);
 
 						//content-range
 						if (isset($_SERVER['HTTP_RANGE']) && !$this->binary)  {
@@ -303,4 +299,4 @@ if (!class_exists('call_recordings')) {
 	} //class
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/resources/classes/cache.php b/resources/classes/cache.php
index fc25e30cd7..6a5cfd21c4 100644
--- a/resources/classes/cache.php
+++ b/resources/classes/cache.php
@@ -104,7 +104,7 @@ class cache {
 			}
 
 		//cache method memcache 
-			if ($_SESSION['cache']['method']['text'] == "memcache") {
+			if (!empty($_SESSION['cache']['method']['text']) && $_SESSION['cache']['method']['text'] == "memcache") {
 				//connect to event socket
 					$fp = event_socket_create($_SESSION['event_socket_ip_address'], $_SESSION['event_socket_port'], $_SESSION['event_socket_password']);
 					if ($fp === false) {
@@ -128,7 +128,7 @@ class cache {
 			}
 
 		//cache method file
-			if ($_SESSION['cache']['method']['text'] == "file") {
+			if (!empty($_SESSION['cache']['method']['text']) && $_SESSION['cache']['method']['text'] == "file") {
 				//change the delimiter
 					$key = str_replace(":", ".", $key);