Bug in module "Events Booking Upcoming events"

There seems to be a bug in the "Events Booking Upcoming events" module
When using Mozilla Firefox the page is giving a page not found error (other browsers seems to be fine).
It is also interfering with my JTAG login module (not showing Facebook button), this happens to all browsers. :blink:
I tried pinpointing the problem, but the only thing I was managing to conform that it is the EB calendar module.
Please let me know how to fix it!
If you need more info, please let me know.
The site affected is www.duikverenigingcetacea.nl

Hi

Please submit a support ticket sending us the link to the page which we can see the error and super admin account of the site. We are going to check to see why it happens and get it sorted

Regards,

Tuan