Description of the issue:

I had a few garden cloches, fluid pump on a water source with fluid pipes, and connected a XNet controller to control item, energy and fluid flow. It worked fine until I connected a tank from Cyclic onto the fluid pipes with the water, which crashed the server and created a ticking block.

I've reproduced it in a singleplayer world too. (seen below) It happens as soon as there's a tank connected to the fluid pipe and another on the XNet connector, and the XNet controller extracts fluids from the fluid pipe, and inserts into any other fluid sink.

Crashlog:

Here
Exception in log

Versions & Modlist

Running ATM6 1.5.0
with Forge 36.0.9
and IE 1.16.5-4.2.1-131 (I updated the server manually from 4.2.0-130 because of #4604 )

Apparently this was already reported in XNet issues.