Users say your app is broken but you see no errors? Check this

The short answer

The error happened on the user's device, not yours, so you need a record of it. On Supabase, check Logs in your dashboard, and check soon: logs are kept 1 day on the Free plan, 7 days on Pro and 28 days on Team. For errors in the browser, add an error tracker; Sentry's free Developer plan includes 5K errors for one user. On Lovable Pro and above, Project monitoring (in beta) checks recent visitor errors and emails the project owner about important findings.