No idea what the issue is, the crash mentions something about FerriteCore so I don't know if that's related.
crash-2022-02-21_07.07.24-server.txt

I've started the generation again and it seems to be working fine so far. But obviously not ideal that it crashes and has to be started again when I am trying to leave it on overnight and at work to pregen.

Having taken a brief glance at FerriteCore's repository it looks like quite a few people have reported this already (see malte0811/FerriteCore#52 and malte0811/FerriteCore#54) and a fix should be present in malte0811/FerriteCore@f07dabe. I would download an updated version and see if that fixes it for you. If it doesn't, be sure to report an issue to them.