diff --git a/taiga/projects/notifications/services.py b/taiga/projects/notifications/services.py
index d8bfaa24..67fb894a 100644
--- a/taiga/projects/notifications/services.py
+++ b/taiga/projects/notifications/services.py
@@ -270,7 +270,7 @@ def send_sync_notifications(notification_id):
 
     for user in notification.notify_users.distinct():
         context["user"] = user
-        context["lang"] = user.lang
+        context["lang"] = user.lang or settings.LANGUAGE_CODE
         email.send(user.email, context)
 
     notification.delete()