Check if setting exists before trying to count (#7071)

Co-authored-by: Tim Fry <tim@fusionpbx.com>

resources/functions.php

@@ -278,7 +278,7 @@
 			//set default false
 			$result = false;
 			//search for the permission
-			if (count($_SESSION["groups"]) > 0) {
+			if (isset($_SESSION["groups"]) && count($_SESSION["groups"]) > 0) {
 				foreach ($_SESSION["groups"] as $row) {
 					if ($row['group_name'] == $group) {
 						$result = true;