placing a milk clay bucket into cheese machine crashes the game
crash-2021-01-10_12.11.01-server.txt

Yes this is an issue of this mod:

https://github.com/Alex-the-666/Rats/blob/1d5cdead8ba22b6d2e65141278154992b2f57274/src/main/java/com/github/alexthe666/rats/server/entity/tile/TileEntityAutoCurdler.java#L207

The FluidUtil.getFluidHandler(ItemStack) returns a LazyOptional<IFluidHandlerItem> instead of just an IFluidHandlerItem object.

fixed