Industrial Foregoing Version: 1.12.2-1.12.12-236
TeslaCoreLib Version: 1.12.2-1.0.15
Crashlog (If Any): https://pastebin.com/8ZBzaAU9
Forge: 2837
Game Type: Multiplayer

Placed down a black hole tank and immediately crashed the server. Restarted several times and googled this issue but everyone was crashing with brewer. Not this case. I placed several at my area with no issues, a friend placed one and killed server. I tried to replicate and cannot do it.

The reason for this (back in January): #28 (comment)

Also disabling both bottles as fluid containers in EnderCore config will not get rid of the crash.

To temporarily fix this for anyone else that sees this post:
1.) Backup your world.
2.) edit config/forge.cfg
change both of these entries to true

B:removeErroringEntities=false
B:removeErroringTileEntities=false

3.) Start server, make sure it didn't just wreck the world. (if fixed then go to number 4)
4.) Shut down server.
5.) Change forge.cfg back to false on above 2 entries.
5.) Start server.