Tell about a situation when you made a mistake in a past project and how you fixed it.

In one of my projects, I made a mistake by improperly handling exceptions when working with an external API. As a result, the application crashed when receiving unexpected data.

To fix the situation, I:

1. Added more precise error handling using specific exception types.
2. Implemented error logging for quick detection of similar situations in the future.
3. Wrote unit tests that simulate different API response scenarios, including incorrect data.

This helped improve the stability of the application and simplified problem diagnosis.