Forge version:
Twilight Forest version: 1.12.2 3.5.263
Link to crash log: https://pastebin.com/BNbYk1Xa

Steps to reproduce:

1. Attempt to plant magic beans in uberous soil

What I expected to happen: Grow beanstalk.

What happened instead: Server had to be rebooted due to lag from the errors.

Try updating to the latest version

Also please give us the full error log, since it reveals more details than just the stacktrace.

was fixed long ago: 91143da