Simulation Error | "TypeError: Cannot read properties of undefined (reading 'has')"

[Griggabyte]

Describe the bug
My gear setup is a bit strange, I'll admit. I'm trying to determine if this is efficient summoning xp/hr.
Gear goes in fine, then I select my desired enemy (Cult Member) and run the simulation on 'Selected', error returns straight away.

To Reproduce
Steps to reproduce the behaviour:

1. Go to 'the Simulate tab'
2. Click on 'Selected'
3. Popup appears
4. See error

Expected behavior
Before updating this morning, simulation was running fine on this exact gear setup

Screenshots

Device:
Steam

Additional context
As stated, only happening since recent update. I'm only reporting in case it hasn't been flagged and my setup is unique somehow.

Save
Attach your save file using one of the following:
Melvor Bug Report.txt

Any of the three is fine.

Mod List
[Myth] Combat Simulator
Mastery Pool Can Overflow
Handy Dandy Notebook
Kills in Combat

[mythridium]

Thanks so much for reporting this issue, this was an error introduced from the latest hotfix to the game.

I've released a fix for this issue in v3.0.53.