I cannot replicate the problem, it is working fine for me.
The line giving issues is:
$plugin = $_PLUGINS->getLoadedPlugin( 'user', 'cbmybadges' );
In your case, that one is returning a null value, and that's why you get the error later in the code.
I have debugged this at my site, and it correctly returns the plugin details, so I don't know why it does not work for you.
You can email me access details and I will try to take a look at your site.
