Minecraft Version:

1.12.2

Forge Version:

14.23.5.2838

ChanceCubes Version:

1.12.2-5.0.2.345

The Issue:

My friend got teleported by a chance block and later he opened a icosahedron then crashed the server.

Origin:

Twitch RAD (roguelike adventure and dungeons )modpack
https://www.curseforge.com/minecraft/modpacks/roguelike-adventures-and-dungeons

Logs:

https://gist.github.com/alexps99/1769316809aa261008e8186436157ce5

The only issue I am seeing is pointing to random loot. https://github.com/TheMarstonConnell/randomlootmod/issues I'd start there.