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• Forge Version: Forge-14.23.5.2854
• Calculator Version: 1.12.2-5.0.12-15
• SonarCore Version: 1.12.2-5.0.19-20
• Multiplayer or Singleplayer: Multiplayer
• Crash Report Link: https://pastebin.com/pEhy3iXd
• Affected Features: N/A
• Description: When using the Atomic Multiplier within a server the game stops, freezes, then eventually crashes locally. It doesn't seem to affect the server.

Just adding that I am getting the same crash in single-player with same Calculator and Sonar Core versions as above.
This is in 'Beyond the Skies' mod pack.
-- Edit --
I took a look at the code - the error occurs checking to see if an item is blacklisted. I deleted my "AtomicMultiplier-BlackList.cfg" file and let it get re-created on launch, and it works now. Must have been an improperly formatted entry.