diff --git a/exposition/views.py b/exposition/views.py
index 4c019d58..7219441f 100644
--- a/exposition/views.py
+++ b/exposition/views.py
@@ -409,8 +409,8 @@ def add_note(request, slug):
         ct = ContentType.objects.get_for_model(e)
         object_id = e.id
         user = request.user
-        if Note.objects.filter(user=user, content_type=ct, object_id=object_id).exists():
-            Note.objects.filter(user=user, content_type=ct, object_id=object_id).update(text=text)
+        if Note.objects.filter(user__id=user.id, content_type=ct, object_id=object_id).exists():
+            Note.objects.filter(user__id=user.id, content_type=ct, object_id=object_id).update(text=text)
         else:
             Note.objects.create(content_type=ct, object_id=object_id, user=user, text=text)