500 internal Server error when adding new items #1511

I'm getting a 500 Internal server error when trying to add a new item.

This is fresh install and my docker-compose file looks like this:

services:
heimdall:
image: lscr.io/linuxserver/heimdall:latest
container_name: heimdall
environment:
- PUID=1000
- PGID=1000
- TZ=Etc/UTC
- ALLOW_INTERNAL_REQUESTS=true #optional
volumes:
- /home/luna/heimdall/config:/config
ports:
- 80:80
- 443:443
restart: unless-stopped