knockout.js - knockout observable array push adding only first object -

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i have observable array. assume (object) data has id, name, description

self.selectedobjects =  ko.observablearray(); self.selectedobjects.push(data); self.selectedobjects.push(data);

line number 1 , 2 work fine. @ line number 3 debug point vanishes , never comes back.

this simple example works well, may problem somewhere else 

var viewmodel = new function() {     var self = this;     var data = {"id" : "id1", "name" : "name1"};     self.selectedobjects =  ko.observablearray();     self.selectedobjects.push(data);     self.selectedobjects.push(data); }  ko.applybindings(viewmodel);

jsfiddle demo


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