diff --git a/public/assets/js/backend/oa/custom_schedule.js b/public/assets/js/backend/oa/custom_schedule.js
index 26af232..fdc857e 100644
--- a/public/assets/js/backend/oa/custom_schedule.js
+++ b/public/assets/js/backend/oa/custom_schedule.js
@@ -47,7 +47,7 @@ define(['jquery', 'bootstrap', 'backend', 'table', 'form', 'editable'], function
                         emptytext: '_',
                         pk: 1,
                         source: [
-                            {value: '0', text: ''},
+                            {value: '', text: ''},
                             {value: '1', text: '早班'},
                             {value: '2', text: '中班'},
                             {value: '3', text: '晚班'},
@@ -58,7 +58,7 @@ define(['jquery', 'bootstrap', 'backend', 'table', 'form', 'editable'], function
                                 return false;
                             } else {
                                 const map = {
-                                    '0': '',
+                                    '': '',
                                     '1': '早班',
                                     '2': '中班',
                                     '3': '晚班',
@@ -113,7 +113,7 @@ define(['jquery', 'bootstrap', 'backend', 'table', 'form', 'editable'], function
                                 emptytext: '_',
                                 pk: 1,
                                 source: [
-                                    {value: '0', text: ''},
+                                    {value: '', text: ''},
                                     {value: '1', text: '早班'},
                                     {value: '2', text: '中班'},
                                     {value: '3', text: '晚班'},
@@ -124,7 +124,7 @@ define(['jquery', 'bootstrap', 'backend', 'table', 'form', 'editable'], function
                                         return false;
                                     } else {
                                         const map = {
-                                            '0': '',
+                                            '': '',
                                             '1': '早班',
                                             '2': '中班',
                                             '3': '晚班',