From aa84d6d8db0d5d4891528a6f8a55660f0be22786 Mon Sep 17 00:00:00 2001
From: Syrus Akbary <me@syrusakbary.com>
Date: Sat, 17 Sep 2016 12:05:05 -0700
Subject: [PATCH] Improved objecttype typemap duplication

---
 graphene/types/typemap.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/graphene/types/typemap.py b/graphene/types/typemap.py
index 1547c893..af193a9b 100644
--- a/graphene/types/typemap.py
+++ b/graphene/types/typemap.py
@@ -119,6 +119,9 @@ class TypeMap(GraphQLTypeMap):
     def construct_objecttype(self, map, type):
         from .definitions import GrapheneObjectType
         if type._meta.name in map:
+            _type = map[type._meta.name]
+            if is_graphene_type(_type):
+                assert _type.graphene_type == type
             return map
         map[type._meta.name] = GrapheneObjectType(
             graphene_type=type,