diff --git a/HauptManager/module.php b/HauptManager/module.php
index ef5b117..f7ca7d3 100644
--- a/HauptManager/module.php
+++ b/HauptManager/module.php
@@ -54,7 +54,7 @@ class HauptManager extends IPSModule
 
            $decodedUser = json_decode(GetValue($user["User_Up"]), true);
 
-            if (isset($decodedUser["Timestamp"]) && (($currentTime - $decodedUser["Timestamp"])) < 30) {
+            if (isset($decodedUser["Timestamp"]) && ((($currentTime - $decodedUser["Timestamp"])) < 30) && array_key_exists('User', $decodedUser)) {
                 
                 foreach ($decodedUser["User"] as $subuser) {
                     $subuser['Writeback'] = $user["User_Down"];