Crashlog: https://gist.github.com/phit/09e7af7cead0046efbcc1acb1f0cc6b2
Mod version: IntegratedDynamics-1.12-0.8.7.jar

Description from the player:

It was a block that had a cable, redstone reader, redstone writer in it. I broke the reader then the writer dissapeared and the cable disconnected from surrounding things
then I tried to break it and it wouldnt break so I tried relogging

when he relogged the server crashed, and crashed every time thereafter the player loaded the chunk
had to remove it manually via mcedit to stop the crashing

Note to self: updateableElementsTicks is not being initialized correctly if the part was not loaded initially.