As promised, I'd reopen the issue if it happened again. This time with all the additional enchantment data. Crash happens specifically when I click on the Minecraft Creative Search Tab. JEI search does not appear to be affected.

Crashlog: https://paste.ee/p/Kbggx

P.S. It can never be said enough but, "Thank you for all the work you do."

Thanks. I tried all the mods with enchantments in the list, but couldn't get it to crash. And I'm still not sure how that line creates an "array index out of bounds" when there are no arrays being accessed. I think I can still prevent the crash, but it would be better to know what is going wrong.

Any news on this? Does it still crash with the latest version?

Just tested with the latest betas on Curseforge. Things appear to be working now.