I have a problem with UI Tab ajaxOptions

I have a problem with UI Tab ajaxOptions

Hi:

  Here's the thing: I'm using the UI Tabs like this:

$('#tabs').tabs({
    select: function(event, ui) {
        if ( ui.tab.hash == "#tabs-admin")
        {
            window.location.href="/backend.php/";
        }
    }
 }
);

I have three different tabs:

Main, Reports and Admin.

The main tab is static html, Reports gets loaded through ajax and Admin redirects to a different page.
The problem is when I select Reports. I get an error saying ajaxOptions is null, but according to the documentation, this is an ok value for this option... what am I missing?

Thanks!