Describe the bug
I'm not sure what caused the crash, but all of my players and I got the same report at the same time upon entering The End. We're in version 1.6.1. Please let me know if you have any questions!

Crash Logs
https://paste.dimdev.org/omaqafolen.mccrash

I think I fixed it. I can't seem to replicate the crash, but I found what could be causing it. I'm working on other small fixes right now as well and I'll try to push out an update tomorrow.

Cool, thank you!

Fixed in 1.6.2 - the update also includes several changes to world generation and you'll need to let delete the mod's config to let the game generate an updated one.