Version Information

Minecraft: 1.12.2
Forge: 2598
Mantle: 1.3.1.21
Natura: 4.3.2.42
Hunger Overhaul: 1.3.0 jenkins 137

Report Information

There is a concurrent modification exception at startup that was not present in the previous version.

Crash Log

https://gist.github.com/ElvenChaos/21f5078632d674c2883c6cce45e98f4b

Forge Log

https://gist.github.com/ElvenChaos/33e80cdf998aaa53ccb78349caa7b121

Thank you for the bug report! I will look into this in the morning and I have gone and pushed a build that should temporarily resolve the issue.