diff --git a/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php b/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
index 493681d5c..ac59de62e 100644
--- a/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
+++ b/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
@@ -536,7 +536,7 @@ final class SingleTaskController extends AbstractController
 
                 if (null !== $task->getAssignee()) {
                     $this->eventDispatcher->dispatch(
-                        new AssignTaskEvent($task),
+                        new AssignTaskEvent($task, null),
                         AssignTaskEvent::PERSIST
                     );
                 }
diff --git a/src/Bundle/ChillTaskBundle/Event/AssignTaskEvent.php b/src/Bundle/ChillTaskBundle/Event/AssignTaskEvent.php
index 0a98d1edf..a7eca02f4 100644
--- a/src/Bundle/ChillTaskBundle/Event/AssignTaskEvent.php
+++ b/src/Bundle/ChillTaskBundle/Event/AssignTaskEvent.php
@@ -20,7 +20,7 @@ class AssignTaskEvent extends Event
     final public const PERSIST = 'chill_task.assign_task';
     public function __construct(
         private readonly SingleTask $task,
-        private readonly User $initialAssignee,
+        private readonly ?User $initialAssignee,
     ) {}
 
     public function getTask(): SingleTask
@@ -28,7 +28,7 @@ class AssignTaskEvent extends Event
         return $this->task;
     }
 
-    public function getInitialAssignee(): User
+    public function getInitialAssignee(): ?User
     {
         return $this->initialAssignee;
     }