diff --git a/app/call_block/call_block.php b/app/call_block/call_block.php
index cdd9bece1a..e531aaba27 100644
--- a/app/call_block/call_block.php
+++ b/app/call_block/call_block.php
@@ -307,7 +307,7 @@
 			if (permission_exists('call_block_edit')) {
 				$list_row_url = "call_block_edit.php?id=".urlencode($row['call_block_uuid']);
 				if ($row['domain_uuid'] != $_SESSION['domain_uuid'] && permission_exists('domain_select')) {
-					$list_row_url .= '&domain_uuid='.urlencode($row['domain_uuid']).'&domain_change=true';
+					$list_row_url .= '&domain_uuid='.urlencode($row['domain_uuid'] ?? '').'&domain_change=true';
 				}
 			}
 			echo "<tr class='list-row' href='".$list_row_url."'>\n";