builder.html.js

diff --git a/builder.html.js b/builder.html.js
index 88ce845..c961300 100644 (file)
--- a/builder.html.js
+++ b/builder.html.js
@@ -54,7 +54,7 @@ Builder  = {
         
         var cfg =  this.tree;
         //console.log(this.dump(cfg));
-        if (!cfg.items[0]) {
+        if (!cfg || !cfg.items || !cfg.items[0]) {
             return;
         }