Vaultwarden port does not start

When starting vaultwarden, it complains about non-existing home directory:

rcctl -d start vaultwarden
doing _rc_parse_conf
vaultwarden_flags empty, using default ><
doing rc_check
vaultwarden
doing rc_start
doing _rc_wait_for_start
doing rc_check
No home directory /nonexistent!
Logging in with home = "/".
thread '<unnamed>' panicked at 'failed to allocate a guard page: Operation not permitted (os error 1)', library/std/src/sys/unix/thread.rs:783:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: initialization or cleanup bug
Abort trap
doing _rc_rm_runfile
(failed)

I looked into pkg-readmes and /usr/local/share/doc/vaultwarden but I didn't find any
special setup procedures. The .env files mentions that values can be set if to
override defaults.

I'm not sure how to proceed with it. Switching _vaultwarden home directory using usermod?

Cheers,
Chris