https://pastebin.com/YVtMYsF6

Was reported to me Lothrazar/Cyclic#605

I have checked into my pipe and pump code, it seems ok and it works with many other tanks and fluid related machines.

Actually, that crash log implies you're trying to fill my tank with a null FluidStack. You shouldn't be doing that, but I added a check anyway as it saves some time if someone else tries to do so.

Oh yeah my bad oops. Ill do a null check on my side to. Since Item stacks are never null i must have assumed or gotten lazy.