diff --git a/src/Service/QueueService.php b/src/Service/QueueService.php
index 0c10739..b5b5d0e 100644
--- a/src/Service/QueueService.php
+++ b/src/Service/QueueService.php
@@ -127,11 +127,9 @@ public function createQueue(QueueInterface $queueable): QueueEntityInterface
         return $this->save($this->entityFactory->createQueue($queueable));
     }
 
-    public function flush(QueueEntityInterface $entity = null): QueueEntityInterface
+    public function flush(QueueEntityInterface $entity = null): void
     {
         $this->repository->flush($entity);
-
-        return $entity;
     }
 
     public function save(QueueEntityInterface $entity): QueueEntityInterface