We've traced down the weird "ScreenEvents" crash to GT++.
This crash happens with GT++ Version GT-PlusPlus-1.5.6-Pre-release, but not with GT-PlusPlus-1.5.0-Beta.

Related Stacktrace: https://pastebin.com/SL1sC1ak
Related issue: GTNewHorizons/GT-New-Horizons-Modpack#1651

I do like how you guys run into issues that I've never encountered.
Since adding the code causing this issue, I've looked up several hundred recipes without a crash in both SSP and SMP testing.

Easy fix though.

Since I'm unable to compile your repository; Would you please so kind and provide a compiled Version that includes this fix?

Probably in 16hr~ when I'm finished work and have driven home for the weekend. Let me see what I can do while at work.

I can confirm, that your repo can not be compiled from the box . Many errors taken while compile. Could you create and put compiled version somewhere?

Repo is only missing GT & IC2, so that you grab the latest. Otherwise it builds fine.

I don't have access to my laptop or desktop until Monday. So can't compile anything sorry.