diff --git a/app/time_conditions/time_conditions.php b/app/time_conditions/time_conditions.php
index 7866d7a42a..58843907ab 100644
--- a/app/time_conditions/time_conditions.php
+++ b/app/time_conditions/time_conditions.php
@@ -17,7 +17,7 @@
 
 	The Initial Developer of the Original Code is
 	Mark J Crane <markjcrane@fusionpbx.com>
-	Portions created by the Initial Developer are Copyright (C) 2008-2012
+	Portions created by the Initial Developer are Copyright (C) 2008-2023
 	the Initial Developer. All Rights Reserved.
 
 	Contributor(s):
@@ -47,14 +47,14 @@
 	$text = $language->get();
 
 //get the http post data
-	if (is_array($_POST['time_conditions'])) {
+	if (!empty($_POST['time_conditions']) && is_array($_POST['time_conditions'])) {
 		$action = $_POST['action'];
 		$search = $_POST['search'];
 		$time_conditions = $_POST['time_conditions'];
 	}
 
 //process the http post data by action
-	if ($action != '' && is_array($time_conditions) && @sizeof($time_conditions) != 0) {
+	if (!empty($action) && !empty($time_conditions) && is_array($time_conditions) && @sizeof($time_conditions) != 0) {
 		switch ($action) {
 			case 'copy':
 				if (permission_exists('time_condition_add')) {
@@ -81,11 +81,11 @@
 	}
 
 //get order and order by
-	$order_by = $_GET["order_by"];
-	$order = $_GET["order"];
+	$order_by = $_GET["order_by"] ?? null;
+	$order = $_GET["order"] ?? null;
 
 //add the search string
-	$search = strtolower($_GET["search"]);
+	$search = !empty($_GET["search"]) ? strtolower($_GET["search"]) : null;
 	if (!empty($search)) {
 		$sql_search = "and (";
 		$sql_search .= " 	lower(dialplan_context) like :search ";
@@ -104,22 +104,22 @@
 //get the number of rows in the dialplan
 	$sql = "select count(dialplan_uuid) from v_dialplans ";
 	$sql .= "where true ";
-	if ($_GET['show'] != "all" || !permission_exists('time_condition_all')) {
+	if ((!empty($_GET['show']) && $_GET['show'] != "all") || !permission_exists('time_condition_all')) {
 		$sql .= "and (domain_uuid = :domain_uuid or domain_uuid is null) ";
 		$parameters['domain_uuid'] = $_SESSION['domain_uuid'];
 	}
 	$sql .= "and app_uuid = '4b821450-926b-175a-af93-a03c441818b1' ";
-	$sql .= $sql_search;
+	$sql .= $sql_search ?? null;
 	$database = new database;
-	$num_rows = $database->select($sql, $parameters, 'column');
+	$num_rows = $database->select($sql, $parameters ?? null, 'column');
 
 //prepare to page data
 	$rows_per_page = ($_SESSION['domain']['paging']['numeric'] != '') ? $_SESSION['domain']['paging']['numeric'] : 50;
 	$param = $search ? "&search=".urlencode($search) : null;
-	if ($_GET['show'] == "all" && permission_exists('time_condition_all')) {
+	if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('time_condition_all')) {
 		$param .= "&show=all";
 	}
-	$page = is_numeric($_GET['page']) ? $_GET['page'] : 0;
+	$page = !empty($_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;
@@ -129,7 +129,7 @@
 	$sql .= $order_by != '' ? order_by($order_by, $order) : " order by dialplan_order asc, dialplan_name asc ";
 	$sql .= limit_offset($rows_per_page, $offset);
 	$database = new database;
-	$dialplans = $database->select($sql, $parameters, 'all');
+	$dialplans = $database->select($sql, $parameters ?? null, 'all');
 	unset($sql, $parameters);
 
 //create token
@@ -158,7 +158,7 @@
 	}
 	echo 		"<form id='form_search' class='inline' method='get'>\n";
 	if (permission_exists('time_condition_all')) {
-		if ($_GET['show'] == 'all') {
+		if (!empty($_GET['show']) && $_GET['show'] == 'all') {
 			echo "		<input type='hidden' name='show' value='all'>";
 		}
 		else {
@@ -197,10 +197,10 @@
 	echo "<tr class='list-header'>\n";
 	if (permission_exists('time_condition_edit') || permission_exists('time_condition_delete')) {
 		echo "	<th class='checkbox'>\n";
-		echo "		<input type='checkbox' id='checkbox_all' name='checkbox_all' onclick='list_all_toggle(); checkbox_on_change(this);' ".($dialplans ?: "style='visibility: hidden;'").">\n";
+		echo "		<input type='checkbox' id='checkbox_all' name='checkbox_all' onclick='list_all_toggle(); checkbox_on_change(this);' ".(empty($dialplans) ? "style='visibility: hidden;'" : null).">\n";
 		echo "	</th>\n";
 	}
-	if ($_GET['show'] == "all" && permission_exists('time_condition_all')) {
+	if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('time_condition_all')) {
 		echo th_order_by('domain_name', $text['label-domain'], $order_by, $order, $param, "class='shrink'");
 	}
 	echo th_order_by('dialplan_name', $text['label-name'], $order_by, $order, null, null, ($search != '' ? "search=".$search : null));
@@ -211,7 +211,7 @@
 	echo th_order_by('dialplan_order', $text['label-order'], $order_by, $order, null, "class='center'", ($search != '' ? "search=".$search : null));
 	echo th_order_by('dialplan_enabled', $text['label-enabled'], $order_by, $order, null, "class='center'", ($search != '' ? "search=".$search : null));
 	echo th_order_by('dialplan_description', $text['label-description'], $order_by, $order, null, "class='hide-sm-dn'", ($search != '' ? "search=".$search : null));
-	if (permission_exists('time_condition_edit') && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
+	if (permission_exists('time_condition_edit') && !empty($_SESSION['theme']['list_row_edit_button']['boolean']) && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
 		echo "	<td class='action-button'>&nbsp;</td>\n";
 	}
 	echo "</tr>\n";
@@ -229,7 +229,7 @@
 				echo "		<input type='hidden' name='time_conditions[$x][uuid]' value='".escape($row['dialplan_uuid'])."' />\n";
 				echo "	</td>\n";
 			}
-			if ($_GET['show'] == "all" && permission_exists('time_condition_all')) {
+			if (!empty($_GET['show']) && $_GET['show'] == "all" && permission_exists('time_condition_all')) {
 				if (!empty($_SESSION['domains'][$row['domain_uuid']]['domain_name'])) {
 					$domain = $_SESSION['domains'][$row['domain_uuid']]['domain_name'];
 				}
@@ -261,7 +261,7 @@
 			}
 			echo "	</td>\n";
 			echo "	<td class='description overflow hide-sm-dn'>".$row['dialplan_description']."&nbsp;</td>\n";
-			if (permission_exists('time_condition_edit') && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
+			if (permission_exists('time_condition_edit') && !empty($_SESSION['theme']['list_row_edit_button']['boolean']) && $_SESSION['theme']['list_row_edit_button']['boolean'] == 'true') {
 				echo "	<td class='action-button'>\n";
 				echo button::create(['type'=>'button','title'=>$text['button-edit'],'icon'=>$_SESSION['theme']['button_icon_edit'],'link'=>$list_row_url]);
 				echo "	</td>\n";