[1.12.2] Crash with IC2 Classic

**Describe the bug**
Mod TechReborn version 1.12.2-2.27.3.1084 is crashing with IC2 Classic when deduplicate option is set to true

**Environment**
 - Minecraft: [1.12.2]
 - Mod Loader: [forge: 14.23.5.2854]

**Logs**
https://pastebin.com/FhFzfg31

I don't know if you are still supporting 1.12.2 version but would be nice if you could fix it please :(.