Couldn't find remote ref refs/heads/refs/merge-requests/21391/head

Job #195297046 failed for gitlab-com/www-gitlab-com@c77bf4f0:

Initialized empty Git repository in /builds/gitlab-com/www-gitlab-com/.git/
Fetching changes with git depth set to 10...
Created fresh repository.
fatal: Couldn't find remote ref refs/heads/refs/merge-requests/21391/head
ERROR: Job failed: exit code 1