On the 1.11.2 version of Calculator whenever you get a Dirty or Damaged Circuit in the Extraction Chamber, the server crashes: https://pastebin.com/GRBEv4Kh

i am also on 1.11.2
forge-1.11.2-13.20.0.2285
Calculator-1.11.2-4.0.0

went to use an extraction chamber with dirt got a dirty circuit then crash
Crash Report

Kinda stuck on my Lan World at this time crash was bad enough i was forced to load a back up.

I am on 1.11.2, same crash.

Calculator-1.11.2-4.0.0.jar
forge-1.11.2-13.20.0.2345-universal.jar

report: https://gist.github.com/kwpugh/586a40d8262ca42c57833f15d280527d

Since it crashed on the dirty circuit, I used NBExplorer to remove the contents of the chamber and was able to recover.

Fixed in dev