I'm gonna guess this was an immersive engineering crash, please reopen if you can reproduce it on the latest versions of the mods involved.

Got crashes when I try to open the toolbox from immersive engineering since last update of that mod.
crash-2018-12-10_19.13.11-client.txt

Thanks for the report, can you tell me if you can reproduce the crash consistently; if yes, then how to reproduce it? What versions of the mods involved are you using?

Mouse tweak 2.9 and immersive eng 1.12 87. Happens every time I try to open toolbox from imm eng since his last update

Have you reported it to immersive engineering? If it's their update that introduced the crash maybe it's something on their side. I'll definitely take a look at the Mouse Tweaks side later though.

Yes, it appears I am not the only one. Not reference to mouse tweaks in the other reports