Lovable App Not Working? Here's How to Fix It

Why did my Lovable app suddenly stop working?

The most common cause is a prompt change that touched more files than intended. When Lovable generates code, a single prompt can modify dozens of files at once — and one bad edit to a shared component, a config file, or an import path is enough to bring down the whole preview. The good news: it is almost never permanent.

Other common triggers include a Supabase environment variable that changed, an edge function that hit a timeout, or a dependency version that was silently updated during a build. Before assuming your app is destroyed, rule these out one by one — start with the most recent change and work backward.

This cycle has a name: the **Bug Doom Loop** — the cycle where each Fix attempt spends a credit, generates new file changes, and often introduces a second error while resolving the first. Recognising you are in this cycle early is the single most important skill for Lovable builders.

How do I tell if it's the editor preview or my real app that's broken?

Open the deployed build pop-out preview — the icon in the top right of the editor — and see if your real app loads. The editor preview and the deployed build are separate; a white or blank editor preview does not mean your deployed build is broken. If the pop-out loads correctly, only the editor sandbox is affected, not what your users see.

If the pop-out shows a blank screen too, open browser DevTools (F12) and look at the Console tab. Real runtime errors appear as red lines naming the file and line number. A message like `Cannot find module './auth/useSession'` points directly to the broken import. Copy that string before doing anything else.

What's the fastest way to get back to a working version?

Go to your project timeline or version history and identify the last prompt before things broke. Revert to that checkpoint before making any more edits or clicking Fix. Every additional prompt you run without a stable base risks compounding the damage — and spending credits. Restore first, then diagnose what went wrong with a fresh eye.

1. Open the project timeline (clock icon in the left sidebar).
2. Find the last version where the app was working — check the preview thumbnail.
3. Click Revert to restore that checkpoint.
4. Open the pop-out preview to confirm the restored build loads correctly.
5. Only then, make one small change at a time and re-test before continuing.

Why does clicking 'Fix' keep making it worse?

The Fix button sends a new prompt to Lovable to repair the error it detects. Each attempt spends a credit and generates a new set of file changes — which can introduce a new error. Once an app has 30 or more files, a single prompt routinely touches unintended areas. If Fix has failed twice, stop: you are likely deepening the problem, not solving it.

This is the **Bug Doom Loop** in its clearest form. Each click signals the AI to try a new approach without memory of what the previous Fix attempts changed. The codebase accumulates layers of partial fixes, and tracing which one caused which breakage becomes nearly impossible without returning to a clean checkpoint. Builders who have lost track of how many Fix credits they have spent are almost always well inside the loop.

A related failure mode is **false-fixed hallucination** — Lovable responds 'The issue is now fixed' when the error has merely shifted to a different component. If your tests still fail or the behaviour is still wrong after a 'fixed' response, do not run another prompt: revert and isolate.

How do I confirm my app is actually fixed?

After reverting or making a targeted change, run this verification sequence before calling it done. One test on the happy path is not enough — the most common failure mode is a fix that works in the editor preview but breaks in the deployed runtime or under a real user session.

1. Open the pop-out deployed build and confirm the root route loads without console errors.
2. Open browser DevTools (F12 → Console) and verify there are no red errors on load.
3. Navigate to the specific feature that broke and exercise it — submit the form, click the button, trigger the data load.
4. Check the Supabase dashboard to confirm any expected writes actually appear in the table.
5. Sign out and sign in again to verify auth state is clean and the session persists correctly.
6. If the app uses Stripe, trigger a test event from the Stripe dashboard and confirm the webhook response is 200.

When should I stop self-fixing and get a human?

If you have reverted to a checkpoint and the same break reappears, or if Fix has failed three or more times, the root cause is structural — not something prompt iteration can safely unwind. A senior engineer can diagnose the exact file and line causing the failure, restore a working build without burning more credits, and leave you with a written explanation of what went wrong.

Signs it's time to escalate: the error message is cryptic TypeScript or build output you don't recognise; the break reappears after every revert; or you've lost count of how many Fix credits you've spent. Getting a specialist in early is almost always cheaper than continuing to guess.

**Context rot at file 6–7** is the structural signal that self-fixing will not work: when Lovable has edited six or seven files in a session, it has typically lost track of architectural decisions made in the earlier files. Any further prompting compounds that drift. A human engineer reads the actual source files, not a prompt context window.