--- a/src/js/model.js	Thu May 16 13:34:02 2013 +0200
+++ b/src/js/model.js	Tue Jun 18 11:08:50 2013 +0200
@@ -1009,7 +1009,10 @@
             return (_e.elementType === _listId);
         });
     } else {
-        return this.contents[_listId] || new IriSP.List(this.directory);
+        if (typeof this.contents[_listId] === "undefined") {
+            this.contents[_listId] = new IriSP.List(this.directory);
+        }
+        return this.contents[_listId];
     }
 };