Worked on the valkey-io/valkey repository to address a critical stability issue affecting client tracking workflows. Focused on resolving a crash in the Client TrackingInfo command that occurred when tracking was disabled by default, the solution involved initializing or validating pubsub_data before access to prevent runtime errors. Added regression tests to ensure correct behavior for off-by-default configurations, reducing the risk of future regressions. Utilized C and Tcl to implement the fix, emphasizing robust command handling and thorough unit testing. This work improved the reliability of tracking-related commands and provided clear traceability from technical changes to business outcomes.