diff --git a/js/upgrade.js b/js/upgrade.js
index 56c02bf1b..a75862fd5 100644
--- a/js/upgrade.js
+++ b/js/upgrade.js
@@ -777,6 +777,7 @@ $(document).ready(function () {
       var params = {};
       var $newChannel = $("select[name=channel] option:selected").val();
       var $oldChannel = $("select[name=channel] option.current").val();
+      var versionNumberRegex = /^\d+(.\d+){2,3}$/; // versionNumberRegex no definada, la agregue
 
       $oldChannel = "";