diff --git a/django_etebase/utils.py b/django_etebase/utils.py
index 09028c4..e46cbd0 100644
--- a/django_etebase/utils.py
+++ b/django_etebase/utils.py
@@ -15,7 +15,7 @@ class CallbackContext:
     """Class for passing extra context to callbacks"""
 
     url_kwargs: t.Dict[str, t.Any]
-    user: t.Optional[User]
+    user: t.Optional[User] = None
 
 
 def get_user_queryset(queryset, context: CallbackContext):