Fixed #27217 -- Fixed crash in CreateModel optimization with models that use mixins.

Thanks Simon Charette for review.

1 files changed, 4 insertions, 1 deletions

diff --git a/django/db/migrations/operations/models.py b/django/db/migrations/operations/models.py
index a0e81f5e83..027ebfe95a 100644
--- a/django/db/migrations/operations/models.py
+++ b/django/db/migrations/operations/models.py
@@ -109,7 +109,10 @@ class CreateModel(ModelOperation):
             return True
 
         # Check we didn't inherit from the model
-        models_to_check = [base for base in self.bases if base is not models.Model]
+        models_to_check = [
+            base for base in self.bases
+            if base is not models.Model and isinstance(base, (models.base.ModelBase, six.string_types))
+        ]
         # Check we have no FKs/M2Ms with it
         for fname, field in self.fields:
             if field.remote_field: