1 files changed, 1 insertions, 1 deletions

diff --git a/models.py b/models.py
index a90e9da..4b86961 100644
--- a/models.py
+++ b/models.py
@@ -77,7 +77,7 @@ class GroupManager(Manager):
         if len(group.subgroup) != 0:
             groups_criteria |= reduce(lambda x, y: x | y,
                                       [Q(subgroup=group.subgroup[:i])
-                                       for i in range(1, len(group.subgroup + 1))])
+                                       for i in range(1, len(group.subgroup) + 1)])
 
         return self.get_queryset().filter(groups_criteria, mention=group.mention,
                                           timetable=group.timetable)