diff --git a/openedx/core/lib/django_courseware_routers.py b/openedx/core/lib/django_courseware_routers.py
index ea3a290725..5d6ecec3de 100644
--- a/openedx/core/lib/django_courseware_routers.py
+++ b/openedx/core/lib/django_courseware_routers.py
@@ -51,7 +51,7 @@ class StudentModuleHistoryExtendedRouter(object):
         """
         if model_name is not None:
             model = hints.get('model')
-            if self._is_csmh(model):
+            if model is not None and self._is_csmh(model):
                 return db == self.DATABASE_NAME
         if db == self.DATABASE_NAME:
             return False