diff --git a/flashcards/models.py b/flashcards/models.py
index d4f4fae..557bbb3 100644
--- a/flashcards/models.py
+++ b/flashcards/models.py
@@ -320,7 +320,7 @@ class Flashcard(Model):
         :param user:
         :return: Whether the card is hidden from the user.
         """
-        if self.is_not_hidden: return False
+        if hasattr(self, 'is_not_hidden') and self.is_not_hidden: return False
         return self.is_hidden or self.flashcardhide_set.filter(user=user).exists()
 
     def is_in_deck(self, user):