diff --git a/server/apps/supervision/views.py b/server/apps/supervision/views.py
index 0f9a9c8..8e206a8 100644
--- a/server/apps/supervision/views.py
+++ b/server/apps/supervision/views.py
@@ -170,7 +170,7 @@ class TaskViewSet(CreateUpdateCustomMixin, ModelViewSet):
         mydept = request.user.dept
         belong_depts = get_child_queryset2(mydept)
         queryset = queryset.filter(dept__in = belong_depts)
-        dept = self.request.query_params.get('dept', mydept)
+        dept = self.request.query_params.get('dept', mydept.id)
         queryset = queryset.filter(dept=dept)
         serializer = TaskDeptSerializer(queryset, many=True)
         return Response(serializer.data)