well, i can't say much, it just happens, it happened 2 times since i play with both mods (idk when i started), its pretty rare but anyways i can post the issue wishing for an answer:
Forge: 1.12.2-forge-14.23.5.2854
FoamFix: 0.10.10
PrimalCore: 0.6.105

https://pastebin.com/w13S62gs

To my knowledge, this is not a FoamFix-specific bug.

#267

oh, many thanks for answer, and yeah i'm using the latest forge version, i don't think this will be possible fixed from PrimalCore's side since the mod is dead (i got the same crash 3 days ago), but i know this is not your fault, so there's np, anyways i'm going to open an issue in their issue tracker just for formality