diff --git a/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php b/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
index ac59de62e..37b985755 100644
--- a/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
+++ b/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
@@ -180,7 +180,7 @@ final class SingleTaskController extends AbstractController
                 $em = $this->managerRegistry->getManager();
                 $em->persist($task);
 
-                if (null !== $task->getAssignee()) {
+                if ($initialAssignee !== $task->getAssignee()) {
                     $this->eventDispatcher->dispatch(
                         new AssignTaskEvent($task, $initialAssignee),
                         AssignTaskEvent::PERSIST