TypeError: g is null

TypeError: g is null

Dear support,

I was trying to make the field "category" available on the "Create Ticket" page on the Customer Portal. Well... with no succes, since I can't find out how to put the field on the portal. I tried it with permissions, but that doesn't help.

Also, I made the top bar white in stead of Red, and in the configuration portal it shows up white. But in LIVE it's still red.

Now when I login as customer and want to create a ticket I get the error message "TypeError: g is null". What does go wrong?

See screenshot below for details.

Kind Regards,
Geert