[jQuery] 'J.readyState' is null or not an object

[Donf]

Env : JQuery 1.3.2 , IE8 with script debugging
Trying to setup "timeout" on a ajax request

The error message " 'J.readyState' is null or not an object " occurs
on jquery.js:

.......  if(M.global){o.event.trigger("ajaxSend",[J,M])}var N=function
(X){if(J.readyState==0){if(P){clearInterval(P); .......

So I have to add " J != null&& " before  " J.readyState==0 "

Any one known this ?