Describe the crash
Just testing Aqueducts in server. Yes it causes crash every time world starts, after a few seconds - but world can be saved if water can be removed fast enough, so the crash happens when the world ticks the water I assume? Survival and Creative

To Reproduce
Steps to reproduce the behavior:

1. Place a length of Aqueducts down with walls
2. Place water in with a bucket
3. Crash

Crash Log
https://paste.dimdev.org/egovolohuk.mccrash

Info (please complete the following information):

• Modpack Version: 2.76
• Server or Singleplayer: Both
• Version the world was created on: 2.76

Additional context
Potential linked commit: CalaMariGold@2ff5132

Fixed in the next version. 2.76.2(?)