[Libreoffice] unable to create 'refs/heads/master.lock' in libs-extern-sys

[Caolán McNamara]

So, messages are...

[libs-extern-sys]$ git push
Counting objects: 75, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (50/50), done.
Writing objects: 100% (50/50), 14.41 KiB, done.
Total 50 (delta 31), reused 0 (delta 0)
fatal: unable to create 'refs/heads/master.lock': File exists
fatal: The remote end hung up unexpectedly

the other repos I can push, just not this one, google suggests that the
problem is at the server side, not my side ? 

C.