[Sentry] TypeError: undefined is not an object (evaluating 'n.flatMap')

[sentry-io]

Sentry Issue: METAMASK-MOBILE-31ZW

TypeError: undefined is not an object (evaluating 'n.flatMap')
  at None (app:///main.jsbundle:4661:386)
  at E (app:///main.jsbundle:2878:564)
  at None (app:///main.jsbundle:2877:1041)
  at E (app:///main.jsbundle:2878:564)
  at None (app:///main.jsbundle:2877:1007)
...
(16 additional frame(s) were not displayed)

[sentry-io]

Sentry Issue: METAMASK-MOBILE-320N

[sentry-io]

Sentry Issue: METAMASK-MOBILE-33JJ

[smilingkylan]

Better Sentry stacktrace:
https://metamask.sentry.io/issues/6064227489

[sentry-io]

Sentry Issue: METAMASK-MOBILE-349E

[gauthierpetetin]

Comment from @Cal-L during today's technical refinement session:

• flatMap issue still exists so let's keep that. Last seen on 7.37.1
  Area of impact - The selector selectFlattenedKeyringAccounts has undefined keyrings value. Recommend to triage to Accounts team

[gauthierpetetin]

Re-assigning this to the @MetaMask/account-management team

[sentry-io]

Sentry Issue: METAMASK-MOBILE-37H4

[Gudahtt]

This seems like another "render before initialization" issue, cc @Cal-L

Post-initialization, the keyrings state property is always an array. Even when locked, it's an empty array, never undefined.

[Gudahtt]

Ah, after looking further at the stack trace, it might not be a "render" issue after all. getTraceTags is called before initialization as well, which uses selectors but isn't render-related.

[Gudahtt]

From reviewing the linked Sentry issues, there are 2 older ones with minified stack traces that haven't recurred since v7.34.0. The others are all from getTraceTags. #13598 should resolve the problem.

This may not be a Sev1 either, but the impact isn't entirely clear to me. We'll close it soon either way.