Worked on stabilizing comment processing in the Automattic/wordpress-activitypub repository by addressing a critical bug related to null handling in PHP backend code. Focused on improving the reliability of the get_comment_type_slugs function, the developer implemented a null-safe approach to prevent fatal errors when global variables are unexpectedly null. This targeted fix enhanced the stability of comment workflows and reduced the risk of runtime failures. Emphasized defensive coding practices and maintainability, leveraging PHP and unit testing to ensure robust error handling. The work contributed to a more resilient backend, minimizing future defect leakage and lowering ongoing support requirements for the integration.