diff --git a/apps/collection/models.py b/apps/collection/models.py
index 61e59788..e3ca63be 100644
--- a/apps/collection/models.py
+++ b/apps/collection/models.py
@@ -120,7 +120,7 @@ class Collection(ProjectBaseMixin, CollectionDateMixin,
                 for instance in instances.all():
                     raw_object = (instance.id, instance.establishment_type.index_name,
                                   instance.slug) if \
-                        hasattr(instance, 'slug') else (instance.id, None)
+                        hasattr(instance, 'slug') else (instance.id, None, None)
                     raw_objects.append(raw_object)
 
         # parse slugs