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• Forge Version: 1.12.1-forge1.12.1-14.22.1.2485
• Calculator Version: calculator-1.12.1-5.0.0
• SonarCore Version: sonarcore-1.12.1-5.0.0
• Multiplayer or Singleplayer: Single
• Crash Report Link: https://pastebin.com/RSDgVqGH
• Affected Features: Transferring Items from machines i.e. outputting
• Description: It doesn't matter how the items are being output or what they're being output from, but it's only with machines from Calculator, and I have to go into MCEdit and delete whatever block is outputting the items.
  A classic way I keep getting this crash is trying to automate circuits; whether it be the processing chamber, the analysing chamber, or any part of the system, if a transfer upgrade and a method of outputting the items (another Calculator machine that can use the output items, storage, e.t.c.) the game freezes for about a second & crashes.

Here's my mod list:

appliedenergistics2-rv5-alpha-4
AutoRegLib-1.3-13
Baubles-1.12-1.5.1
bdlib-1.14.2.8-mc1.12.1
Botania r1.10-347
calculator-1.12.1-5.0.0
CodeChickenLib-1.12-3.1.2.297-universal
CoFHCore-1.12-4.3.5.13-universal
CoFHWorld-1.12-1.0.1.8-universal
cucumber[1.12]-1.0.2
environmentaltech-1.12.1-2.0.2d
extrautils2-1.12-1.6.3
FastLeafDecay-v14
generators-0.9.20.7-mc1.12.1
ImmersiveEngineering-0.12-72
ImmersiveEngineering-0.12-72-core
InventoryTweaks-1.63+beta.108
jei_1.12.1-4.7.8.95
journeymap-1.12.1-5.5.0b4
Mantle-1.12-1.3.1.21
mcjtylib-1.12-2.4.4
Mekanism-1.12.1-9.4.1.326
MekanismGenerators-1.12.1-9.4.1.326
mysticalagriculture[1.12]-1.6.3
Psi-r1.1-53
RedstoneFlux-1.12-2.0.1.2-universal
Reliquary-1.12-1.3.4.710
rftools-1.12-6.13
rftoolsdim-1.12-5.05
sonarcore-1.12.1-5.0.0
TConstruct-1.12-2.7.3.30
ThermalDynamics-1.12-2.3.5.12-universal
ThermalExpansion-1.12-5.3.5.19-universal
ThermalFoundation-1.12-2.3.5.14-universal
TinkerToolLeveling-1.12-1.0.2b
valkyrielib-1.12.1-2.0.2c

This same issue was also in 1.11.2, which I created a thread about: #273 Had basically the same mod list there too.

looks like the base inventory is still using null instead of empty item stacks

Fixed in dev