During December 2025, Associated Bull contributed to the facebook/react-native repository by addressing a critical stability issue in the Android native bridge. They resolved a NullPointerException that occurred in Promise.reject when the code parameter was null, enhancing error handling in Kotlin-based native modules. By allowing the code parameter to be nullable and defaulting to EUNSPECIFIED when necessary, Associated Bull prevented application crashes during native module invocations. The solution involved updates to Promise.kt and PromiseImpl.kt, validated through end-to-end tests simulating real-world usage. Their work demonstrated a focused application of Android development and Kotlin skills to improve reliability in cross-platform environments.