add

trans2es/models/topic.py

@@ -85,7 +85,7 @@ class Topic(models.Model):
     def get_virtual_vote_num(self):
 
         try:
-            topic_extra = TopicExtra.object.get(topic_id=self.id)
+            topic_extra = TopicExtra.objects.filter(topic_id=self.id)
             return topic_extra.virtual_vote_num
         except:
             return 0