diff --git a/advanced_filters/models.py b/advanced_filters/models.py
index 33f1b28..d72a422 100644
--- a/advanced_filters/models.py
+++ b/advanced_filters/models.py
@@ -15,7 +15,8 @@
 class UserLookupManager(models.Manager):
     def filter_by_user(self, user):
         """All filters that should be displayed to a user (by users/group)"""
-
+        if not hasattr(user, 'groups'):
+            return self.filter(users=user)
         return self.filter(Q(users=user) | Q(groups__in=user.groups.all()))