Roughly half of the time, while loading this with Enigmatica 2 (Expert), Java crashes. The crash has not been duplicated without FoamFix, and can be duplicated by loading Enigmatica 2 Expert a few times. The attached log has been modified to replace my authentication token with [REDACTED], because having said token is a security risk.
hs_err_pid6612.log

That happen a lot for me in any of my packs. a fix would be to use your system java version assuming it's up to date.

Oh, I meant to add that there is a solution to this. Just uninstall FoamFix.

I have not managed to reproduce this, but then again - I cannot test with Mojang's specific build of Java, as I do not have a Windows setup to run such properly.

I'm also getting this issue in a custom pack

#258

Specific to Mojang's build of Java; disabling model deduplication should work around it FOR NOW.

I know it has literally been a year but I'm gonna add my two cents: Had this happening with my custom pack too, some people say that setting fboEnable:false in the options.txt this issue can be avoided (not prevented completely though). Might just also be random chance.