Why does this site and mine get a javascript error

Looking at vbseo and Walt Disney World Orlando Visiting Forum both sites give a javascript error in the firebug plugin.

The error is y has no properties and it looks like its related to google analytics.

Any idea what the issue is?

Thanks.

Hello,

do you get any details (javascript name/line number)?

Hello,

do you get any details (javascript name/line number)?

It's http://www.google-analytics.com/ga.js line 29.

The only reason I asked here is because I wondered if it was the way vbseo was creating the google analytics code?

vBSEO uses the code recommended by Google: How do I add tracking code to my website?