diff --git a/server/apps/supervision/views.py b/server/apps/supervision/views.py
index 01cdf13..6156e63 100644
--- a/server/apps/supervision/views.py
+++ b/server/apps/supervision/views.py
@@ -525,7 +525,7 @@ class Task2DoViewSet(ListModelMixin, GenericViewSet):
         field = request.data.get('key')
         theattr = getattr(obj, field, None)
         if theattr is None:
-            theattr = 0
+            setattr(obj, field, 0)
             if field == 'num_complaint':
                 obj.num_complaint_10 = 0
             elif field == 'num_pt':