diff --git a/apps/course/views.py b/apps/course/views.py
index c6450396..16b297c6 100644
--- a/apps/course/views.py
+++ b/apps/course/views.py
@@ -49,7 +49,7 @@ def coursecomment(request, course_id):
             'errors': ['Course with id f{cource_id} not found']
         }, status=400)
     else:
-        reply_to = request.POST.get('reply_id', None)
+        reply_to = request.POST.get('reply_id', 0)
         comment = request.POST.get('comment', '')
         if not comment:
             return JsonResponse({