GitLab: No user or key was provided

root@localhost:/home/git/gitlab-satellites/root/rep# git push
Counting objects: 6834, done.
Delta compression using up to 3 threads.
Compressing objects: 100% (5339/5339), done.
Writing objects: 100% (6833/6833), 13.52 MiB | 17.65 MiB/s, done.
Total 6833 (delta 1370), reused 6833 (delta 1370)
remote: GitLab: No user or key was provided.
To /home/git/repositories/root/rep.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to β€˜/home/git/repositories/root/rep.git’

Ubuntu 15.04
Apache2
GitLab 7.12.0
GitLab Shell 2.6.3
GitLab API v3
Ruby 2.2.2p95
Rails 4.1.11