Summary
In this detailed account, Vicente G. Reyes, lead developer of Rev6.fit, shares a critical bug that went unnoticed in their free trial funnel due to a flawed condition in a guard preventing trial eligibility. The blog post outlines the symptoms, root cause, fix, and lessons learned from the incident, highlighting the limitations of error monitoring tools like Sentry in catching logical errors that prevent revenue. The article emphasizes the importance of testing user paths, clear conditions in code, and behavioral monitoring to catch logical issues that impact revenue.