I´m not sure to whom the issue belongs, so i'm opening one in both issue tracker, got a random CTD when generating world while having Additional Structures installed, not really sure why, but if i reconnect to the world, i can keep going as if nothing happened, until it crashes again.

Minecraft 1.12.2
Forge 2838
Mod Ver 1.1.2

https://paste.dimdev.org/qudatasiva.mccrash