ActionView::Template::Error (string contains null byte)... https://<gitlab>/<group>/<repo>/commit/<hash>

Steps to reproduce

Ticket: https://gitlab.zendesk.com/agent/tickets/103097 (internaly)

Customer:

I could reproduce the issue with a minimal repo and it's on gitlab.com

https://gitlab.com/hbre/faultyrepo

The second commit contains a file which is viable in the Web Editor 
https://gitlab.com/hbre/faultyrepo/blob/master/.gitattributes

but when you click and commit in the repo you get a 500 error. 
https://gitlab.com/hbre/faultyrepo/commit/22f5920021bf007580aa9b3895d53ac68e51173c

If you open it in Web IDE you just see junk 
https://gitlab.com/-/ide/project/hbre/faultyrepo/edit/master/-/.gitattributes

Example Project

https://gitlab.com/hbre/faultyrepo

What is the current bug behavior?

You get a 500 error