I am using jquery $.post for Updating form data to MVC method,but sometimes the ajax post call gets aborted

Question

if (_form.valid() && isValid == true) {

        $.post(getUrlFromRootPath(_form.attr("action")), _form.serialize(), function (data) {
                if (data.isvalid != null && data.isvalid == false) {
                }
         });

On browser network traffic it shows request aborted.