diff --git a/server/src/controllers/schedule.controller.js b/server/src/controllers/schedule.controller.js
index 85a38f7..89267d5 100644
--- a/server/src/controllers/schedule.controller.js
+++ b/server/src/controllers/schedule.controller.js
@@ -153,7 +153,7 @@ class ScheduleController {
             }
     
             let scheduleDetails = schedule.schedule_detail;
-            schedule.schedule_detail = null;
+            schedule.schedule_detail = [];
             await schedule.save()
     
             for (const detailUpdate of schedule_detail) {