diff --git a/Entity/Document.php b/Entity/Document.php
index 67159ad7d..586d52035 100644
--- a/Entity/Document.php
+++ b/Entity/Document.php
@@ -162,7 +162,7 @@ class Document implements HasScopeInterface
         return $this->object;
     }
     
-    public function setObject(StoredObject $object)
+    public function setObject(StoredObject $object = null)
     {
         $this->object = $object;