Huu Chi Vu contributed to the MyCoRe-Org/mycore repository by addressing a stability issue in OAI parameter resolution. He implemented a robust null-check path within the MCROAIParameterQuerySetResolver, ensuring that missing values in the set map are handled gracefully and preventing NullPointerException crashes during OAI workflows. This targeted backend fix, delivered in Java, improved the reliability of data ingestion processes without introducing new features or altering existing functionality. Huu Chi Vu’s work demonstrated careful defensive programming and effective issue triage, resulting in a low-risk, auditable change that enhanced the core module’s stability and maintained the integrity of backend operations.