The issue looks to be issues with our Javascript loading properly. JFBConnect requires our Javascript library file to be loaded first. Then, there's some Javascript parameters we put on the page. The problem is in the following script call on your page:
<script src="/components/com_jfbconnect/includes/jfbconnect.js?v=6" type="text/javascript" defer="defer"></script>
That 'defer="defer"' tag is making our Javascript load later, which is causing the parameters we set to fail.. and that's leading to some null variables.
Can you disable whatever is trying to optimize the page by setting all Javascript files to be deferred? I wasn't able to find whatever was doing it in the admin area. At the very list, our jfbconnect.js file should be excluded.
I hope that helps get you going, but if you need more assistance, please let us know.
Thanks,
Alex