FancyFluidStorage Version:
Fancy Fluid Storage-1.12-2.1.3.jar

MinecraftForge Version:
Minecraft Version: 1.12.2(modded) forge-14.23.5.2768

Client or Server?:

• Client
• Server

Crash Report (via. Pastebin):
https://pastebin.com/zncZmLUS

What happens / happened?:
Immediately when 2nd block placed

How can we reproduce it?:
Running in a SP game.
Accidently placed a 2nd tank valve next to another valve that was already part of a formed tank w/liquid in it. The 2nd valve was not supposed to be part of a tank or anything, just added to the ground in front of it.