diff --git a/app/repositories/project.py b/app/repositories/project.py
index 36c818a..a698071 100644
--- a/app/repositories/project.py
+++ b/app/repositories/project.py
@@ -54,7 +54,8 @@ class ProjectRepository(BaseRepository[ProjectModel]):
             update.design.code = 'D' + code
             if update.monitor:
                 update.monitor.code = 'S' + code
-                update.has_monitor = True
+        if update.monitor:
+            update.has_monitor = True
         update.u_at()
         await use_collection(COLLECTION).update_one({"_id":_id},{"$set":update.mongo_dict()})
         return await self.get(_id)