First, i'm very sorry for my bad english. I'm actually came from another country.
Recently a weird bug had been occured in my LAN world, when my friend started crafting a liquid barrel, the product is not what he looking for, at first we think it is just a weird bug from JEI or NEI, but when my friend try to do it manually, the game crashed and a crash report appeared. I had tried to do it on my own but no luck, it also happen with brewing barrel and solid barrel