fix

Signed-off-by: dartcafe <github@dartcafe.de>

lib/Notification/Notifier.php

@@ -118,7 +118,7 @@ class Notifier implements INotifier {
 			$pollTitle = $poll->getTitle();
 			$notification->setLink($poll->getVoteUrl());
 		} catch (DoesNotExistException $e) {
-			$this->notificationService->removeNotification($notification->getObjectId());
+			$this->notificationService->removeNotification(intval($notification->getObjectId()));
 			return $notification;
 		}