[BUG]: Deleting Custom Study Session Deck crashes app

[brishtibheja]

Checked for duplicates?

• [X] This issue is not a duplicate

Does it also happen in the desktop version?

• [ ] This bug does not occur in the latest version of Anki

What are the steps to reproduce this bug?

1. Custom Study
2. Preview new cards
3. Now delete the custom study session's deck

Expected behaviour

Nothing happens

Actual behaviour

App crashes

Debug info

AnkiDroid Version = 2.18alpha7 (1c5a6b3c220d67a75dd4b4d78e1fc8a6cc4b4789)

Backend Version = provider(?) (23.12.1 1a1d4d5419c6b57ef3baf99c9d2d9cf85d36ae0a)

Android Version = 11 (SDK 30)

ProductFlavor = full

Manufacturer = realme

Model = RMX2193

Hardware = mt6768

Webview User Agent = null

ACRA UUID = cf265e01-9693-407f-984d-61ddf9698fac

FSRS Enabled = true

Crash Reports Enabled = true

(Optional) Anything else you want to share?

No response

Research

• [X] I am reporting a bug specific to AnkiDroid (Android app)
• [X] I have checked the manual and the FAQ and could not find a solution to my issue
• [X] (Optional) I have confirmed the issue is not resolved in the latest alpha release (instructions)

[lukstbit]

Thanks for the bug report. I've created a fix which should be available in the next alpha.

[brishtibheja]

@lukstbit I just realized I forgot to add that this also happened with "review ahead".

[lukstbit]

I've just tested with my fix and Review ahead doesn't crash. If you see this with the new alpha(containing the fix) please open a new bug report so I can take a look.