Originally reported by Dwelle at: http://bugs.jquery.com/ticket/15160

Aborting jqXHR objects inside ajaxSend results in ajaxError and ajaxComplete callbacks being called twice. On first execution, jqXHR's status is "abort", on second execution, it throws TypeError: Cannot read property 'send' of undefined .

JSFiddle:  http://jsfiddle.net/LK2g3/

tested on Chrome 35, FF 30, jQuery 1.9.1, 1.11.1, 2.1.1

Issue reported for jQuery 1.11.1