Originally thought this was because of the new Chipped update, but was pointed in this direction as it seems to be a CTM issue. I tried a solution in a different issue that suggested backdating didn't work, no versions of CTM seemed to work.

Mod version: 1.1.5+5
Forge Version: 40.1.51
Crash report: https://pastebin.com/YEvWLhQX

Found my problem in a closed issue after some digging. Caused by my forge version