diff --git a/Classes/Psmb/Newsletter/Controller/SubscriptionController.php b/Classes/Psmb/Newsletter/Controller/SubscriptionController.php
index 3ea0f80..45d89a3 100644
--- a/Classes/Psmb/Newsletter/Controller/SubscriptionController.php
+++ b/Classes/Psmb/Newsletter/Controller/SubscriptionController.php
@@ -103,6 +103,9 @@ public function registerAction(Subscriber $subscriber = null)
                     $this->redirect('feedback');
                 }
             }
+        } else {
+            $this->addFlashMessage('No subscriber provided', null, Message::SEVERITY_WARNING);
+            $this->redirect('feedback');
         }
     }