Hello! Me and my friend were playing on 1.12.2 forge server and we wanted to put Horse Tack on our horses (Mod Horse Tack) but whenever we put something in the gui it just crashed the whole game, i thought it was an issue in the mod Horse Tack first but then figured out it wasn't, since we added another mod with horse supplies and it did the same thing. I have no idea what the problem might be. Though it wrote Exit Code: -1 and Error Code: 255
Hope you can help, ty beforehand <3

Edit: Figured out it's only happening on multiplayer server, when i went to single it was okay. Now i don't understand even more lmao

I haven't been able to make this happen on my own computer. Does it crash every time? And has it happened with only Realistic Horse Genetics and no other mods?

Closing due to inactivity.