Tiny fix in the counter

counter/models.py

@@ -163,7 +163,7 @@ class Counter(models.Model):
     def can_be_viewed_by(self, user):
         if self.type == "BAR" or self.type == "EBOUTIC":
             return True
-        return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP) or user in self.sellers
+        return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP) or user in self.sellers.all()
 
     def gen_token(self):
         """Generate a new token for this counter"""