diff --git a/src/vendor/Export2Excel.js b/src/vendor/Export2Excel.js
index c6aae14137022bd0d673dd5be5edb0f9984a5bfa..4370da368414e64b1f8edc0faabe3e61bd648c7b 100644
--- a/src/vendor/Export2Excel.js
+++ b/src/vendor/Export2Excel.js
@@ -128,8 +128,12 @@ export function export_json_to_excel(th, jsonData, defaultTitle) {
 
     /*莅丞舟worksheet罸������鎀у�綺�*/
     const colWidth = data.map(row => row.map(val => {
-      /*�ゆ�㊥����減筝㊥��*/
-      if (val.toString().charCodeAt(0) > 255) {
+      /*���ゆ�㊥����減null/undefined*/
+      if (val == null) {
+        return {'wch': 10};
+      }
+      /*���ゆ�㊥����減筝㊥��*/
+      else if (val.toString().charCodeAt(0) > 255) {
         return {'wch': val.toString().length * 2};
       } else {
         return {'wch': val.toString().length};