No UI. Crashed. Where are the logs located?

Been using this for a few days day, this morning I can’t connect to the web UI. I haven’t changed anything since it was last working.

I can connect over SSH, if I try a ‘hassio ha restart’ or stop / start I get
ERROR
panic: interface conversion: interface is nil, not string

Where are the logs located to see what’s going on?

Home assistant logs are in the config directory