Google Analytics Ecommerce doesn't work with Safari5

Question

My code works with Firefox and Chrome, but not with Safari5. I'm using the Asynchronous version of GA Ecommerce Tracking.

Here's the relevant part of my code:

var trans = _gaq.push(['_addTrans', productDetails['orderId'], productDetails['affiliation'], rpc]);    
_gaq.push(['_addItem', productDetails['orderId'], productDetails['sku'], productDetails['sku'], productDetails['category'], rpc, '1']);
_gaq.push(['_trackTrans']);

In Safari's Error console, I see this:

 http://www.google-analytics.com/__utm.gif?utmwv=4.7.2&utmn=2025082825&utmhn=beta.xxx.com&utmt=tran&utmtid=1015707207&utmtst=www.amazon.com&utmtto=0.5&utmttx=undefined&utmtsp=undefined&utmtci=undefined&utmtrg=undefined&utmtco=undefined&utmac=UA-12019682-1&utmcc=&gaq=1

 Failed to load resource: cancelled

Anyone has ideas what's going on?

Thanks!