diff --git a/www/code/main.js b/www/code/main.js
index ee4fd2f0f..1ee726097 100644
--- a/www/code/main.js
+++ b/www/code/main.js
@@ -253,6 +253,7 @@ define([
                     var clike = /^\s*(\/\*|\/\/)(.*)?(\*\/)*$/;
                     if (clike.test(line)) {
                         line.replace(clike, function (a, one, two) {
+                            if (!two) { return; }
                             text = two.replace(/\*\/\s*$/, '').trim();
                         });
                         return true;