Ticket #16281: 16281.diff

django/contrib/contenttypes/models.py

@@ -100 +100 @@
         method. The ObjectNotExist exception, if thrown, will not be caught,
         so code that calls this method should catch it.
         """
-        return self.model_class()._base_manager.using(self._state.db).get(**kwargs)
+        return self.model_class()._base_manager.using(self.model_class().objects.db).get(**kwargs)
 
     def natural_key(self):
         return (self.app_label, self.model)