diff --git a/Classes/Controller/ExtendController.php b/Classes/Controller/ExtendController.php
index 6532ac4..7530625 100644
--- a/Classes/Controller/ExtendController.php
+++ b/Classes/Controller/ExtendController.php
@@ -74,7 +74,7 @@ public function dialogAction()
         // check if fe_user exists OR cookie for private usage is set
         // return empty string
         if ($user || $GLOBALS["TSFE"]->fe_user->getKey("ses", $this->settings['dialog']['cookieName'])) {
-            return '';
+            return;
         }
 
         //get request arguments