Error message:Nonetype object is not subscriptable

Anki Help
1

When I undo answer card in anki 2.1.46 and I use V3 scheduler, anki gave me an error message:
image
What’s wrong?

2

When problems occur

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3

Thanks. After check, I found Card Retirement - AnkiWeb or Mortician - AnkiWeb conflict with V3 scheduler

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