diff --git a/public/react/src/modules/ec/ecCourseSupportSetting/EditableCourseSupportSetting.js b/public/react/src/modules/ec/ecCourseSupportSetting/EditableCourseSupportSetting.js
index 099cbf2d..ec580594 100644
--- a/public/react/src/modules/ec/ecCourseSupportSetting/EditableCourseSupportSetting.js
+++ b/public/react/src/modules/ec/ecCourseSupportSetting/EditableCourseSupportSetting.js
@@ -289,7 +289,7 @@ class EditableCourseSupportSetting extends Component {
         standard_grade[item.position] = (item.standard_grade);
         // biyeYaoqiuZhibiaodian[item.position] = (item.biyeYaoqiuZhibiaodian);
 
-        subitem_id[item.position] = (item.subitem_id).toString();
+        subitem_id[item.position] = item.subitem_id ? (item.subitem_id).toString() : item.subitem_id;
 
         this.position2Target_idMap[item.position] = item.target_id
     })