diff --git a/inc/class.zoneclear.feed.server.php b/inc/class.zoneclear.feed.server.php
index 1c84ce8..a7efb55 100644
--- a/inc/class.zoneclear.feed.server.php
+++ b/inc/class.zoneclear.feed.server.php
@@ -716,7 +716,7 @@ class zoneclearFeedServer
         } else {
             dcCore::app()->auth = null;
             dcCore::app()->auth = new dcAuth();
-            dcCore::app()->auth->checkUser($this->user);
+            dcCore::app()->auth->checkUser($this->user ?? '');
         }
     }