Was testing some things with active coolers and the creative water source when it crashed...
crash-2017-08-15_02.22.32-server.txt

Same crash on 1.11.2 using my own modpack. Using NuclearCraft 2.3aFixaroo. Player placed a infinite water source block between an active liquid cooler block and a supercooler block. Right after that the server went into an infinite crash loop until I managed to destroy the water block. Here is a couple of the reports.

crash-2017-08-21_17.04.43-server.txt
crash-2017-08-21_17.06.42-server.txt
crash-2017-08-21_17.08.45-server.txt

I think I've fixed this issue for the next release - just a silly nullPointer bug that slipped through initial testing :)

Pretty sure that this is fixed in version 2.4 :)