Unable to create temporary file: No space left on device

I can't push to bitbucket at the moment, I get the following error:

Compressing objects: 100% (6/6), done.
Writing objects: 100% (6/6), 527 bytes | 0 bytes/s, done.
Total 6 (delta 5), reused 0 (delta 0)
remote: error: unable to create temporary file: No space left on device
remote: fatal: failed to write object
error: unpack failed: unpack-objects abnormal exit
To git@xxx/xxx.git
! [remote rejected] master -> master (unpacker error)
error: failed to push some refs to 'git@xxx/xxx.git'