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**Root cause:** The Polymarket API returns `null` for the
`orderPriceMinTickSize` field on some sports markets. Our code was
calling `.toString()` on that value without a null check, which threw a
runtime error. Since the entire batch of events was parsed in a single
`.map()`, one bad event crashed the whole thing and returned an empty
list.

**Fix:**
1. Changed `market.orderPriceMinTickSize.toString()` to
`market.orderPriceMinTickSize?.toString() ?? '0.01'` to safely handle
the null.
2. Updated the TypeScript type to `number | null` to correctly reflect
what the API actually returns.
3. Changed the event parsing loop from `.map()` to `.flatMap()` with a
per-event `try/catch`, so a single malformed event is skipped and logged
instead of taking down the whole batch.

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CHANGELOG entry: football prediction markets not loading

Fixes: https://consensyssoftware.atlassian.net/browse/ASSETS-3259

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    Then [describe expected outcome]
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- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
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if applicable
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guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

- [ ] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [ ] I've tested with a power user scenario
- Use these [power-user
SRPs](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [ ] I've instrumented key operations with Sentry traces for production
performance metrics
- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes market parsing defaults and error handling for Polymarket
events; while localized, it can affect tick-size-dependent pricing
behavior and which events appear if parsing failures occur.
>
> **Overview**
> Fixes Polymarket sports markets failing to load when the API returns a
`null` `orderPriceMinTickSize`.
>
> Updates the Polymarket market type to allow `orderPriceMinTickSize:
number | null`, safely derives `tickSize` with a fallback default, and
makes `parsePolymarketEvents` resilient by parsing each event in a
`try/catch` (logging and skipping only the bad event instead of failing
the whole batch).
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
1f8de4a. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Luis Taniça <matallui@gmail.com>