Worked on the alibaba/nacos repository to improve the stability of the configuration migration process by addressing a critical null pointer exception in the ConfigMigrateService. Focused on backend development using Java, the work involved implementing robust exception handling to guard against null values when comparing migration source users, specifically preventing crashes when the createUser field was null. This targeted fix enhanced the reliability of migration workflows, reducing the risk of production outages for customers. The solution was traceable to a specific commit, demonstrating careful attention to code safety and maintainability, and laying a foundation for future improvements in migration processes.