404 when removing associated Pages Domain

Description of the problem

Need to remove associated domain to a GitLab page repository in order to update the Let's Encrypt certificate, it throws error 404

Which Group/Project (with full path) is experiencing the issue?

https://gitlab.com/robmv/robmv.gitlab.io

Approximate date/time when the error occurred.

2016-12-22 14:05 pm UTC

Describe what you were doing right before the issue occurred.

Clicked the button remove for domain www.marcanoonline.com, it shows error 404 at page https://gitlab.com/robmv/robmv.gitlab.io/pages/domains/www.marcanoonline.com

Note: Trying to add a new domain with the same name says the domain already exist, so it was not deleted when it gave the error. Domain expire in a few weeks.