During November 2025, Hagar Yasser focused on stability improvements in the debezium/debezium repository, addressing a critical issue in UUIDSet subtraction. She resolved a potential NullPointerException by introducing a null check for the right-hand operand, ensuring that the current instance is returned when the operand is null. This approach, implemented in Java, enhanced the robustness of UUIDSet operations within data-processing pipelines. Hagar also developed a regression test using unit testing practices to verify correct behavior when subtracting from a null operand. Her work demonstrated careful attention to defensive programming and contributed to more reliable software in the repository.