Cloning private repo fails

`sudo systemctl status caddy.service -l` produces the following error:

`May 08 06:55:02 app-1 systemd[1]: Started Caddy HTTP/2 web server.`
`May 08 06:55:02 app-1 caddy[23804]: Activating privacy features... done.`
`May 08 06:55:02 app-1 caddy[23804]: 2018/05/08 06:55:02 cannot git clone into /var/www, directory not empty`
`May 08 06:55:02 app-1 systemd[1]: caddy.service: Main process exited, code=exited, status=1/FAILURE`
`May 08 06:55:02 app-1 systemd[1]: caddy.service: Unit entered failed state.`
`May 08 06:55:02 app-1 systemd[1]: caddy.service: Failed with result 'exit-code'.
`

The /var/www directory is completely empty, but every time I start caddy, it adds a ".ssh" directory to it. Any ideas?

Caddy file is:

`git {
repo https://github.com/username/repo.git
branch master
key /ssh/id_rsa
hook /servicePush password
}
`