javascript - Uncaught InvalidStateError in JSON.stringify -


i've read other thread , no good: put data json jquery

whenever try json.stringify object array error saying: 

uncaught invalidstateerror: attempt made use object not, or no longer, usable.

here js:

            var responseitems = [];              var keynotecontainer = $('div.keynote-questions');             var eventquestioncontainer = $('div.event-questions');             var sessioncontainer = $('div.session-questions');             var eventid = $('#evaluation-event-id').val();              keynotecontainer.children().each(function (index, el) {                 var element = $(el);                  var id = "-1";                 var parentid = element.find('input[type=hidden]').val();                 var parenttype = "keynote";                 var responsevalue = element.find('.response-item-slider').slider("option", "value");                 var responsetext = "";                  var response = { "id": id, "eventid": eventid, "parentid": parentid, "parenttype": parenttype, "responsevalue": responsevalue, "responsetext": responsetext };                 responseitems.push(response);             });                                  eventquestioncontainer.children().each(function (index, el) {                 var element = $(el);                  var id = "-1";                 var parentid = element.find('input[type=hidden]').val();                 var parenttype = "eventquestion";                 var responsevalue = element.find('.response-item-slider').slider("option", "value");                 var responsetext = element.find('textarea').val();                  var response = { "id": id, "eventid": eventid, "parentid": parentid, "parenttype": parenttype, "responsevalue": responsevalue, "responsetext": responsetext };                 responseitems.push(response);             });              sessioncontainer.children().each(function (index, el) {                 var element = $(el);                  var id = "-1";                 var parentid = element.find('input[type=hidden]').val();                 var parenttype = "session";                 var responsevalue = element.find('.response-item-slider').slider("option", "value");                 var responsetext = "";                  var response = { "id": id, "eventid": eventid, "parentid": parentid, "parenttype": parenttype, "responsevalue": responsevalue, "responsetext": responsetext };                 responseitems.push(response);             });              responseitems = json.stringify(responseitems);

i've tried log , breaks @ last line stringify it.

how can fix this? piece of advise or information highly appreciated.

i had same error. in case, had forgotten .val() when setting 1 of model properties. there wasn't error until tried json.stringify model

        this.model.set(         {             customername: this.$("#customername").val(),             jobtitle: this.$("#jobtitle"),  //this line causing error             testimonialtext: this.$("#testimonialtext").val()         });

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