diff --git a/app/extensions/extensions.php b/app/extensions/extensions.php
index 87453779a0..c553135a22 100644
--- a/app/extensions/extensions.php
+++ b/app/extensions/extensions.php
@@ -48,14 +48,14 @@
 	$text = $language->get();
 
 //get posted data
-	if (is_array($_POST['extensions'])) {
+	if (!empty($_POST['extensions']) && is_array($_POST['extensions'])) {
 		$action = $_POST['action'];
 		$search = $_POST['search'];
 		$extensions = $_POST['extensions'];
 	}
 
 //process the http post data by action
-	if ($action != '' && is_array($extensions) && @sizeof($extensions) != 0) {
+	if (!empty($action) && !empty($extensions) && is_array($extensions) && @sizeof($extensions) != 0) {
 		switch ($action) {
 			case 'toggle':
 				if (permission_exists('extension_enabled')) {
@@ -80,8 +80,8 @@
 	}
 
 //get order and order by
-	$order_by = $_GET["order_by"];
-	$order = $_GET["order"];
+	$order_by = $_GET["order_by"] ?? '';
+	$order = $_GET["order"] ?? '';
 
 //get total extension count for domain
 if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
@@ -94,7 +94,7 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 }
 
 //add the search term
-	$search = strtolower($_GET["search"]);
+	$search = strtolower($_GET["search"] ?? '');
 	if (!empty($search)) {
 		$sql_search = " and ( ";
 		$sql_search .= "lower(extension) like :search ";
@@ -119,21 +119,21 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 
 //get total extension count
 	$sql = "select count(*) from v_extensions where true ";
-	if (!($_GET['show'] == "all" && permission_exists('extension_all'))) {
+	if (!(!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('extension_all'))) {
 		$sql .= "and domain_uuid = :domain_uuid ";
 		$parameters['domain_uuid'] = $_SESSION['domain_uuid'];
 	}
-	$sql .= $sql_search;
+	$sql .= $sql_search ?? '';
 	$database = new database;
-	$num_rows = $database->select($sql, $parameters, 'column');
+	$num_rows = $database->select($sql, $parameters ?? null, 'column');
 
 //prepare to page the results
 	$rows_per_page = ($_SESSION['domain']['paging']['numeric'] != '') ? $_SESSION['domain']['paging']['numeric'] : 50;
 	$param = "&search=".$search;
-	if ($_GET['show'] == "all" && permission_exists('extension_all')) {
+	if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('extension_all')) {
 		$param .= "&show=all";
 	}
-	$page = is_numeric($_GET['page']) ? $_GET['page'] : 0;
+	$page = isset($_GET['page']) && is_numeric($_GET['page']) ? $_GET['page'] : 0;
 	list($paging_controls, $rows_per_page) = paging($num_rows, $param, $rows_per_page); //bottom
 	list($paging_controls_mini, $rows_per_page) = paging($num_rows, $param, $rows_per_page, true); //top
 	$offset = $rows_per_page * $page;
@@ -153,13 +153,13 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 	}
 	$sql .= limit_offset($rows_per_page, $offset);
 	$database = new database;
-	$extensions = $database->select($sql, $parameters, 'all');
+	$extensions = $database->select($sql, $parameters ?? null, 'all');
 	unset($sql, $parameters);
 
 //get the registrations
 	if (permission_exists('extension_registered')) {
 		$obj = new registrations;
-		if ($_GET['show'] == 'all') {
+		if (!empty($_GET['show']) && $_GET['show'] == 'all') {
 			$obj->show = 'all';
 		}
 		$registrations = $obj->get('all');
@@ -185,25 +185,25 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 	}
 	$margin_left = permission_exists('extension_import') || permission_exists('extension_export') ? "margin-left: 15px;" : null;
 	if (permission_exists('extension_add') && (!is_numeric($_SESSION['limit']['extensions']['numeric']) || $total_extensions < $_SESSION['limit']['extensions']['numeric'])) {
-		echo button::create(['type'=>'button','label'=>$text['button-add'],'icon'=>$_SESSION['theme']['button_icon_add'],'id'=>'btn_add','style'=>$margin_left,'link'=>'extension_edit.php']);
+		echo button::create(['type'=>'button','label'=>$text['button-add'],'icon'=>$_SESSION['theme']['button_icon_add'],'id'=>'btn_add','style'=>($margin_left ?? ''),'link'=>'extension_edit.php']);
 		unset($margin_left);
 	}
 	if (permission_exists('extension_enabled') && $extensions) {
-		echo button::create(['type'=>'button','label'=>$text['button-toggle'],'icon'=>$_SESSION['theme']['button_icon_toggle'],'id'=>'btn_toggle','name'=>'btn_toggle','style'=>'display: none; '.$margin_left,'onclick'=>"modal_open('modal-toggle','btn_toggle');"]);
+		echo button::create(['type'=>'button','label'=>$text['button-toggle'],'icon'=>$_SESSION['theme']['button_icon_toggle'],'id'=>'btn_toggle','name'=>'btn_toggle','style'=>'display: none; '.($margin_left ?? ''),'onclick'=>"modal_open('modal-toggle','btn_toggle');"]);
 		unset($margin_left);
 	}
 	if (permission_exists('extension_delete') && $extensions) {
 		if (permission_exists('voicemail_delete')) {
-			echo button::create(['type'=>'button','label'=>$text['button-delete'],'icon'=>$_SESSION['theme']['button_icon_delete'],'id'=>'btn_delete','name'=>'btn_delete','style'=>'display: none; '.$margin_left,'onclick'=>"modal_open('modal-delete-options');"]);
+			echo button::create(['type'=>'button','label'=>$text['button-delete'],'icon'=>$_SESSION['theme']['button_icon_delete'],'id'=>'btn_delete','name'=>'btn_delete','style'=>'display: none; '.($margin_left ?? ''),'onclick'=>"modal_open('modal-delete-options');"]);
 		}
 		else {
-			echo button::create(['type'=>'button','label'=>$text['button-delete'],'icon'=>$_SESSION['theme']['button_icon_delete'],'id'=>'btn_delete','name'=>'btn_delete','style'=>'display: none; '.$margin_left,'onclick'=>"modal_open('modal-delete');"]);
+			echo button::create(['type'=>'button','label'=>$text['button-delete'],'icon'=>$_SESSION['theme']['button_icon_delete'],'id'=>'btn_delete','name'=>'btn_delete','style'=>'display: none; '.($margin_left ?? ''),'onclick'=>"modal_open('modal-delete');"]);
 		}
 		unset($margin_left);
 	}
 	echo 		"<form id='form_search' class='inline' method='get'>\n";
 	if (permission_exists('extension_all')) {
-		if ($_GET['show'] == 'all') {
+		if (!empty($_GET['show']) && $_GET['show'] == 'all') {
 			echo "		<input type='hidden' name='show' value='all'>";
 		}
 		else {
@@ -252,10 +252,10 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 	echo "<tr class='list-header'>\n";
 	if (permission_exists('extension_enabled') || permission_exists('extension_delete')) {
 		echo "	<th class='checkbox'>\n";
-		echo "		<input type='checkbox' id='checkbox_all' name='checkbox_all' onclick='list_all_toggle(); checkbox_on_change(this);' ".($extensions ?: "style='visibility: hidden;'").">\n";
+		echo "		<input type='checkbox' id='checkbox_all' name='checkbox_all' onclick='list_all_toggle(); checkbox_on_change(this);' ".(empty($extensions) ? "style='visibility: hidden;'" : null).">\n";
 		echo "	</th>\n";
 	}
-	if ($_GET['show'] == "all" && permission_exists('extension_all')) {
+	if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('extension_all')) {
 		echo "<th>".$text['label-domain']."</th>\n";
 		//echo th_order_by('domain_name', $text['label-domain'], $order_by, $order);
 	}
@@ -273,7 +273,7 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
  	}
 	echo th_order_by('enabled', $text['label-enabled'], $order_by, $order, null, "class='center'");
 	echo th_order_by('description', $text['label-description'], $order_by, $order, null, "class='hide-sm-dn'");
-	if (permission_exists('extension_edit') && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
+	if (permission_exists('extension_edit') && !empty($_SESSION['theme']['list_row_edit_button']['boolean']) && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
 		echo "	<td class='action-button'>&nbsp;</td>\n";
 	}
 	echo "</tr>\n";
@@ -291,7 +291,7 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 				echo "		<input type='hidden' name='extensions[$x][uuid]' value='".escape($row['extension_uuid'])."' />\n";
 				echo "	</td>\n";
 			}
-			if ($_GET['show'] == "all" && permission_exists('extension_all')) {
+			if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('extension_all')) {
 				echo "	<td>".escape($_SESSION['domains'][$row['domain_uuid']]['domain_name'])."</td>\n";
 			}
 			echo "	<td>";
@@ -345,7 +345,7 @@ if (is_numeric($_SESSION['limit']['extensions']['numeric'])) {
 			}
 			echo "	</td>\n";
 			echo "	<td class='description overflow hide-sm-dn'>".escape($row['description'])."</td>\n";
-			if (permission_exists('extension_edit') && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
+			if (permission_exists('extension_edit') && !empty($_SESSION['theme']['list_row_edit_button']['boolean']) && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
 				echo "	<td class='action-button'>";
 				echo button::create(['type'=>'button','title'=>$text['button-edit'],'icon'=>$_SESSION['theme']['button_icon_edit'],'link'=>$list_row_url]);
 				echo "	</td>\n";