diff -r 3ce493c93d6c -r f3fec80dd31c src/js/serializers/JSONSerializer.js
--- a/src/js/serializers/JSONSerializer.js	Mon Oct 24 16:51:22 2011 +0200
+++ b/src/js/serializers/JSONSerializer.js	Mon Oct 24 17:25:54 2011 +0200
@@ -3,7 +3,7 @@
   IriSP.Serializer.call(this, DataLoader, url);
 };
 
-IriSP.JSONSerializer.prototype = IriSP.Serializer;
+IriSP.JSONSerializer.prototype = new IriSP.Serializer();
 
 IriSP.JSONSerializer.prototype.serialize = function(data) {
   return JSON.stringify(data);
@@ -15,7 +15,7 @@
 
 IriSP.JSONSerializer.prototype.sync = function(callback) {
   /* we don't have to do much because jQuery handles json for us */
-  
+
   /* a wrapper to get a closure because we lose this in callbacks */
   var wrapper = function(obj) {
     return function(data) {