Hypothetical blind play error

[JustinClimbsSeattle]

Describe the bug
I got an error with a stack trace I wish I'd copied. Repro in the details below. Feel free to close if insufficient info- not sure whether I have email notifications enabled for this GitHub account
I filled a separate bug for the ux issue of destroying the current tab when clicking file on GitHub, but since the link used my tab with the game, i don't have precise details.

To Reproduce
Steps to reproduce the behavior:

1. Finish a game (with blind play of the last card enabled)
   My game variant was 6 suits including black and rainbow
2. Enter hypothetical
3. I gave a hint
4. Next, I tried to blind play the last card
5. Error dialog w stack trace
   Note: Reload page doesn't clear the error or allow continuing the game review

Expected behavior

1. Blind play the last card in hypothetical should succeed without error
2. Reloading the page in a hypothetical with an error should allow continuing the game review, ideally in a lkg state, or minimally a fresh hypothetical state.

Screenshots
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Additional context
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