the buildParams funcion , called by $.ajax, fails when you pass an object that contains functions. For eg:

var data = {

myProp:"hello",

fnc : function(){

return;

}

}

$.post('url',{obj:data}, function(){});

it can be easily fixed by adding the following guard instruction:

function buildParams(prefix, obj, traditional, add) {

if (jQuery.type(obj) === "function") return;

.....

}