Error pushing puppet-nfs.git to GitLab -- "zeroPaddedFilemode: contains zero-padded file modes"

zen@tails ~/puppet-nfs.git> (BARE:master) git push --mirror gitlab
Enumerating objects: 980, done.
Counting objects: 100% (980/980), done.
Delta compression using up to 2 threads
Compressing objects: 100% (410/410), done.
Writing objects: 100% (980/980), 124.15 KiB | 62.08 MiB/s, done.
Total 980 (delta 547), reused 980 (delta 547)
remote: error: object c5dad6edfac36f2c86aa0ae4cd51d3525e2397a0: zeroPaddedFilemode: contains zero-padded file modes
remote: fatal: fsck error in packed object
error: remote unpack failed: index-pack abnormal exit
To gitlab.tails.boum.org:tails/puppet-nfs
 ! [remote rejected] feature/Use_rpcbind_rather_than_portmap -> feature/Use_rpcbind_rather_than_portmap (unpacker error)
 ! [remote rejected] master -> master (unpacker error)
 ! [remote rejected] rpcbind-on-Debian-7-and-newer -> rpcbind-on-Debian-7-and-newer (unpacker error)
error: failed to push some refs to 'git@gitlab.tails.boum.org:tails/puppet-nfs'