During September 2025, this developer focused on enhancing the stability of chart rendering in the antvis/GPT-Vis repository. They addressed a critical bug affecting dual-axes visualizations by removing an explicit undefined data assignment and refining the base configuration to prevent rendering failures. Their work involved careful TypeScript coding and applied defensive frontend development practices to ensure resilience against similar edge cases. By aligning configuration handling with defined data paths and linking changes to tracked issues, they improved maintainability and traceability. Although the period did not include new feature development, their targeted bug fix contributed to more robust data visualization workflows.