During March 2025, Tiago Castro Santos enhanced the robustness of the peterbarker/ardupilot repository by addressing a critical issue in the AP_Terrain module. He implemented a pre-arm validation check in C++ to ensure the TERRAIN_SPACING parameter is greater than zero before terrain data processing begins. This embedded systems solution prevents division-by-zero errors that could compromise autonomous flight missions. By introducing early configuration validation, Tiago reduced runtime risks and improved the reliability of flight control software. His focused bug fix, though limited in scope, demonstrated careful attention to system safety and contributed to more dependable terrain handling in autonomous aerial operations.