diff --git a/plugins/dynamix/include/update.wireguard.php b/plugins/dynamix/include/update.wireguard.php
index e611b191d..b08938946 100644
--- a/plugins/dynamix/include/update.wireguard.php
+++ b/plugins/dynamix/include/update.wireguard.php
@@ -1,6 +1,6 @@
 <?PHP
-/* Copyright 2005-2022, Lime Technology
- * Copyright 2012-2022, Bergware International.
+/* Copyright 2005-2023, Lime Technology
+ * Copyright 2012-2023, Bergware International.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2,
@@ -15,7 +15,7 @@ $docroot  = $docroot ?? $_SERVER['DOCUMENT_ROOT'] ?: '/usr/local/emhttp';
 // add translations
 $_SERVER['REQUEST_URI'] = 'settings';
 // special case when script is called on form-submit and processed by update.php
-if (!isset($_SESSION['locale'])) $_SESSION['locale'] = $_POST['#locale'];
+if (!isset($_SESSION['locale'])) $_SESSION['locale'] = $_POST['#locale']??'';
 require_once "$docroot/webGui/include/Translations.php";
 require_once "$docroot/webGui/include/Helpers.php";