Gerrit push for review crashes when working on detatched HEAD

[FredrikNoren]

{
"errorCode": "unkown",
"command": "git -c color.ui=false -c credential.helper="c:/Users/noren/AppData/Roaming/npm/node_modules/ungit/bin/credentials-helper 1" push origin HEAD:refs/for/undefined",
"error": "Error: Command failed: remote: Resolving deltas: 20% (1/5) \u001b[K\rremote: Resolving deltas: 40% (2/5) \u001b[K\rremote: Resolving deltas: 60% (3/5) \u001b[K\rremote: Resolving deltas: 80% (4/5) \u001b[K\rremote: Resolving deltas: 100% (5/5) \u001b[K\rremote: Resolving deltas: 100% (5/5)\u001b[K\nremote: \rremote: Processing changes: refs: 1\u001b[K\rremote: Processing changes: refs: 1, done \u001b[K\nTo noren@git.spotify.net:client-core.git\n ! [remote rejected] HEAD -> refs/for/undefined (branch undefined not found)\nerror: failed to push some refs to 'noren@git.spotify.net:client-core.git'\n",
"stderr": "remote: Resolving deltas: 20% (1/5) \u001b[K\rremote: Resolving deltas: 40% (2/5) \u001b[K\rremote: Resolving deltas: 60% (3/5) \u001b[K\rremote: Resolving deltas: 80% (4/5) \u001b[K\rremote: Resolving deltas: 100% (5/5) \u001b[K\rremote: Resolving deltas: 100% (5/5)\u001b[K\nremote: \rremote: Processing changes: refs: 1\u001b[K\rremote: Processing changes: refs: 1, done \u001b[K\nTo noren@git.spotify.net:client-core.git\n ! [remote rejected] HEAD -> refs/for/undefined (branch undefined not found)\nerror: failed to push some refs to 'noren@git.spotify.net:client-core.git'\n",
"stdout": ""
}