unable to create temporary file: No space left on device

We're getting this error when trying to do a git push

Counting objects: 3, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 321 bytes | 0 bytes/s, done.
Total 3 (delta 2), 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@bitbucket.org:REMOVED
! [remote rejected] releases -> releases (unpacker error)
error: failed to push some refs to 'git@bitbucket.org:REMOVED'