[Plugin: Quick Chat] javascript error "b is undefined"

Hi, one of my clients is using your plug-in, and they recently started seeing an error when a user is not logged in.

In firebug I’m seeing “b is undefined” when quick chat updates the chat window.

If I refresh the page the error goes away.

If I log in, the error goes away.

The theme is using jquery 1.7.1, and we have the latest stable version of the plug-in.

I verified that jquery is not being loaded twice in the theme.

Any ideas or hints?

Thanks!

http://wordpress.org/extend/plugins/quick-chat/