## Summary

In the fictional TrailNotes demonstration, `formatTitle({ title: null })` throws a TypeError because the implementation calls `.trim()` on `null`.

## Reproduction

1. Download the article's `reproduce-crash.mjs` fixture.
2. Run `node reproduce-crash.mjs`.
3. Observe the TypeError and exit code 1.

## Expected behavior

Proposed product behavior: a missing title should render as `Untitled`, or be rejected with an explicit validation error. The product owner needs to choose the intended behavior.

## Actual behavior

`TypeError: Cannot read properties of null (reading 'trim')`

## Evidence

The input is the authored fixture `{"title":null}`. The published `crash-log.txt` contains the observed runtime version, platform and sanitized stack frame. The exception was reproduced in a local Node.js process; this is not a production incident or a device crash capture.

## Suspected cause and next step

The failing fixture line is `return note.title.trim();`. Check the real application's title contract and input validation before choosing a fix. No production code was inspected, and no fix is verified by this report.

## Submission status

Draft only. No GitHub issue has been created. Choose the repository, check for an existing issue, adapt to its issue template, review visibility and authorize submission before posting.