diff --git a/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen.js b/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen.js
index b5bbfabb..ba191776 100755
--- a/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen.js
+++ b/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen.js
@@ -455,6 +455,9 @@
     var generate = function () {
 
         var activeTab = $("ul#CronGenTabs li.active a").prop("id");
+        if (activeTab == undefined) {
+            return;
+        }
         var results = "";
         switch (activeTab) {
             case "SecondlyTab":
diff --git a/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen_en.js b/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen_en.js
index 5e14551c..02f14580 100755
--- a/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen_en.js
+++ b/xxl-job-admin/src/main/resources/static/plugins/cronGen/cronGen_en.js
@@ -455,6 +455,9 @@
     var generate = function () {
 
         var activeTab = $("ul#CronGenTabs li.active a").prop("id");
+        if (activeTab == undefined) {
+            return;
+        }
         var results = "";
         switch (activeTab) {
             case "SecondlyTab":