diff -r 150ccacec493 -r a07c2128b7c1 player/js/metadataplayer-core.js
--- a/player/js/metadataplayer-core.js	Fri Jun 07 17:36:27 2013 +0200
+++ b/player/js/metadataplayer-core.js	Mon Jun 10 18:36:46 2013 +0200
@@ -1180,7 +1180,10 @@
             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];
     }
 };