diff --git a/app/bridges/bridges.php b/app/bridges/bridges.php
index 007c6f4e90..e214f02ee8 100644
--- a/app/bridges/bridges.php
+++ b/app/bridges/bridges.php
@@ -47,14 +47,14 @@
 	$text = $language->get();
 
 //get the http post data
-	if (is_array($_POST['bridges'])) {
+	if (isset($_POST['bridges']) && is_array($_POST['bridges'])) {
 		$action = $_POST['action'];
 		$search = $_POST['search'];
 		$bridges = $_POST['bridges'];
 	}
 
 //process the http post data by action
-	if ($action != '' && is_array($bridges) && @sizeof($bridges) != 0) {
+	if (isset($action) && $action != '' && is_array($bridges) && @sizeof($bridges) != 0) {
 		switch ($action) {
 			case 'copy':
 				if (permission_exists('bridge_add')) {
@@ -81,8 +81,8 @@
 	}
 
 //get order and order by
-	$order_by = $_GET["order_by"];
-	$order = $_GET["order"];
+	$order_by = $_GET["order_by"] ?? '';
+	$order = $_GET["order"] ?? '';
 
 //add the search string
 	if (isset($_GET["search"])) {
@@ -98,7 +98,7 @@
 
 //get the count
 	$sql = "select count(bridge_uuid) from v_bridges ";
-	if ($_GET['show'] == "all" && permission_exists('bridge_all')) {
+	if (isset($_GET['show']) && $_GET['show'] == "all" && permission_exists('bridge_all')) {
 		if (isset($sql_search)) {
 			$sql .= "where ".$sql_search;
 		}
@@ -115,9 +115,9 @@
 
 //prepare to page the results
 	$rows_per_page = ($_SESSION['domain']['paging']['numeric'] != '') ? $_SESSION['domain']['paging']['numeric'] : 50;
-	$param = $search ? "&search=".$search : null;
-	$param = ($_GET['show'] == 'all' && permission_exists('bridge_all')) ? "&show=all" : null;
-	$page = is_numeric($_GET['page']) ? $_GET['page'] : 0;
+	$param = !empty($search) ? "&search=".$search : null;
+	$param = (isset($_GET['show']) && $_GET['show'] == 'all' && permission_exists('bridge_all')) ? "&show=all" : null;
+	$page = isset($_GET['page']) && is_numeric($_GET['page']) ? $_GET['page'] : 0;
 	list($paging_controls, $rows_per_page) = paging($num_rows, $param, $rows_per_page);
 	list($paging_controls_mini, $rows_per_page) = paging($num_rows, $param, $rows_per_page, true);
 	$offset = $rows_per_page * $page;
@@ -156,14 +156,14 @@
 	}
 	echo 		"<form id='form_search' class='inline' method='get'>\n";
 	if (permission_exists('bridge_all')) {
-		if ($_GET['show'] == 'all') {
+		if (isset($_GET['show']) && $_GET['show'] == 'all') {
 			echo "		<input type='hidden' name='show' value='all'>\n";
 		}
 		else {
 			echo button::create(['type'=>'button','label'=>$text['button-show_all'],'icon'=>$_SESSION['theme']['button_icon_all'],'link'=>'?show=all']);
 		}
 	}
-	echo 		"<input type='text' class='txt list-search' name='search' id='search' value=\"".escape($search)."\" placeholder=\"".$text['label-search']."\" onkeydown=''>";
+	echo 		"<input type='text' class='txt list-search' name='search' id='search' value=\"".escape($search ?? '')."\" placeholder=\"".$text['label-search']."\" onkeydown=''>";
 	echo button::create(['label'=>$text['button-search'],'icon'=>$_SESSION['theme']['button_icon_search'],'type'=>'submit','id'=>'btn_search']);
 	//echo button::create(['label'=>$text['button-reset'],'icon'=>$_SESSION['theme']['button_icon_reset'],'type'=>'button','id'=>'btn_reset','link'=>'bridges.php','style'=>($search == '' ? 'display: none;' : null)]);
 	if ($paging_controls_mini != '') {
@@ -189,7 +189,7 @@
 
 	echo "<form id='form_list' method='post'>\n";
 	echo "<input type='hidden' id='action' name='action' value=''>\n";
-	echo "<input type='hidden' name='search' value=\"".escape($search)."\">\n";
+	echo "<input type='hidden' name='search' value=\"".escape($search ?? '')."\">\n";
 
 	echo "<table class='list'>\n";
 	echo "<tr class='list-header'>\n";
@@ -198,14 +198,14 @@
 		echo "		<input type='checkbox' id='checkbox_all' name='checkbox_all' onclick='list_all_toggle(); checkbox_on_change(this);' ".($bridges ?: "style='visibility: hidden;'").">\n";
 		echo "	</th>\n";
 	}
-	if ($_GET['show'] == 'all' && permission_exists('bridge_all')) {
+	if (isset($_GET['show']) && $_GET['show'] == 'all' && permission_exists('bridge_all')) {
 		echo th_order_by('domain_name', $text['label-domain'], $order_by, $order);
 	}
 	echo th_order_by('bridge_name', $text['label-bridge_name'], $order_by, $order);
 	echo th_order_by('bridge_destination', $text['label-bridge_destination'], $order_by, $order);
 	echo th_order_by('bridge_enabled', $text['label-bridge_enabled'], $order_by, $order, null, "class='center'");
 	echo "	<th class='hide-sm-dn'>".$text['label-bridge_description']."</th>\n";
-	if (permission_exists('bridge_edit') && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
+	if (permission_exists('bridge_edit') && isset($_SESSION['theme']['list_row_edit_button']) && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
 		echo "	<td class='action-button'>&nbsp;</td>\n";
 	}
 	echo "</tr>\n";