Mod conflict? If so, please clarify which mod is conflicting, if not skip this.
Regrowth

API/Modloader
Forge

Describe the bug
The game will randomly crash. The crash appears to be related to regrowth attempting to retrieve some (null) data about BYG grass blocks.

To Reproduce

1. Install Regrowth and BYG
2. Wait in a BYG biome with animals around

Expected behavior
The game should not crash.

Logs: https://paste.ee/p/MtQjd

Crossposting from mactso/Regrowth#12.

Since im late, the log has since expired, please use github gists when pasting the log

oh, I had set it to a month. that wasn't pastes fault. I think we had it "fixed" or bypassed from regrowths side :V but they're only bonemealing stone based grass that you use in the Guiana's etc. it causes a crash cause it doesn't know what to do about placing grass or something, cause it's technically a type of stone, or something of the sort.

Fixed by c5cf612 in 1.18.

oh! hey I just got this bug also.

Heres a log. https://pastebin.com/rjCkmJwx

You can see the exception in log file without regrowth by placing down an overgrown stone block and applying bonemeal to it.