Minecraft 1.21.1
NeoForge 21.1.191

crash-2025-07-31_04.30.01-server.txt

crash-2025-07-31_04.34.54-server.txt

divinerpg-1.10.9.1.jar - 1st crash dump
divinerpg-1.10.9.1.jar - 2nd crash dump
divinerpg-1.10.8.4.2.jar - OK

Does this still occur without lithium or modern fix installed? im wondering if its a compatibility thing but need a little more info

Yes, here is crash without lithium, modern fix and farsight

crash-2025-07-31_04.50.44-server.txt

Thank you for sharing. We will look into this

FYI
Crash may be related to chunk generation, because occurs during quick fly on the broom (from Evilcraft) to non-generated area. Dimension is overworld, biomes Snowy Plains and Frozen River and moment of crash is near to enter to Snowy Taiga biome (generation in version 1.10.8.4.2). Mobs around are Frost-s, Glacon-s and jellyfishes.

idk if its the same problem but when I try to use the trumpet of horde or sometimes when im in the ice biome (The default one) it also crashes my game

idk if its the same problem but when I try to use the trumpet of horde or sometimes when im in the ice biome (The default one) it also crashes my game

This is an unrelated bug, but it is patched. However the update with the patch isnt out yet