Possible Fixes

Yes

Modpack Version

other

What happened?

Modpack version is 2.3.0, not sure why it's not selectable in the form
this is related to a crash described in #169
previously, occasionally my Minecraft (with a server hosted using Essential) crashed with this error

this happened once every few hours and was negligible at most
Now, however, that same crash happens every time I load my world and it's impossible to
even get into it
I've tried Curseforge's built in repair tool but I don't expect that or reinstalling the modpack to fix the issue since it seems to be in the world itself
I hope there is some kind of fix for this as I'd rather not lose the world

Crash Log

https://gist.github.com/SennytheSnek/229d3e939332cf6ea77e6bd732886c7c