Ticket #10738: deferred_model_contenttype.2.diff

django/contrib/contenttypes/models.py

@@ -14 +14 @@
         ContentType if necessary. Lookups are cached so that subsequent lookups
         for the same model don't hit the database.
         """
+        if model._deferred:
+            model = model._meta.proxy_for_model
         opts = model._meta
         key = (opts.app_label, opts.object_name.lower())
         try: