1 files changed, 1 insertions, 1 deletions
diff --git a/models.py b/models.py
index cb975ab..3af1c06 100644
--- a/models.py
+++ b/models.py
@@ -86,7 +86,7 @@ class GroupManager(Manager):
 
         return self.get_queryset().filter(*args, timetable=timetable, hidden=False, **criteria) \
                             .annotate(nbsub=Subquery(sub, output_field=models.IntegerField())) \
-                            .filter(nbsub=1).order_by("name")
+                            .filter(Q(nbsub=1) | Q(nbsub__isnull=True)).order_by("name")
 
 
 class Group(models.Model):