Worked on enhancing runtime stability for the facebook/litho repository by addressing a critical bug related to list access patterns in Kotlin-based Android development. Focused on preventing NullPointerExceptions when retrieving the last element from potentially empty lists, the solution involved replacing unsafe calls to ?.last() with the safer ?.lastOrNull() method. This targeted fix improved null-safety and reduced the risk of crashes in production environments, directly contributing to a more robust user experience for Litho-based applications. The change was fully traceable through commit history and linked to a documented issue, demonstrating a methodical approach to stability and code quality in testing workflows.