Fix the failure mode, not just the symptom

Fix what broke

Step-by-step fixes for the issues people keep repeating in real builds: auth, Stripe, Supabase, deploys, state drift, and unsafe defaults.

Do not start with a rebuild. Start with the failure mode you can name, then follow the exact recovery path.

Use this page when

Auth broke
Login loops, blank screens, RLS, and access bugs are blocking the build.
Payments broke
Checkout works, but subscriptions, prices, or entitlements do not update cleanly.
Deploy broke
Environment variables, domains, hosting, or stale state are breaking production.

Quick Answer

What is the fastest way to fix an AI-built app that broke?

Start with the exact symptom and the failing integration, not a generic rebuild. gptsters groups fixes around the recurring failure modes that actually wreck AI-built apps: auth, Stripe, Supabase, deploy state, and unsafe defaults.

Start with the failure you recognize

Pick the recovery path, not the broad category

These are the four failure modes most likely to get a builder unstuck fast. If one of them sounds familiar, open that path first.

If the fix is not the whole decision

Open one of these instead of looping through generic troubleshooting

Use these when the same class of problem keeps coming back and you need a better tool choice, support layer, or workflow answer, not just another patch.

Search all troubleshooting guides by exact problem, tool, or integration.

People usually describe it like this

If the exact symptom is easier to name than the root cause, start with the phrase that sounds closest to what is happening.

If you already know the stack

Integration Fix Clusters

The latest batch added 53 schema-driven fixes across Supabase, Stripe, Clerk, and Resend.

Supabase fixes

16 generated troubleshooting pages across Lovable, Cursor, and Bolt.

Stripe fixes

19 generated troubleshooting pages across Lovable, Cursor, and Bolt.

Clerk fixes

9 generated troubleshooting pages across Lovable, Cursor, and Bolt.

Resend fixes

9 generated troubleshooting pages across Lovable, Cursor, and Bolt.

Lovable Errors

Lovablebeginner

Lovable App Takes 3-5 Seconds to Load

Pages take 3-5 seconds to load

Lovablebeginner

Lovable App Shows a Blank Screen After Deploy

Works in Lovable preview

Lovablebeginner

Why Does Lovable Keep Changing Things I Didn't Ask For?

Asked to change button color, whole layout changed

Lovablebeginner

Lovable Form Submits but Supabase Saves Nothing

Form submits successfully but data doesn't appear in Supabase

Lovablebeginner

Lovable Login Works in Preview but Fails on the Live URL

Login works in preview but fails on the live URL

Lovablebeginner

Lovable Stripe Checkout Fails or Cards Are Declined

Payment form shows but card is declined

Lovablebeginner

Lovable Looks Fine on Desktop but Breaks on Mobile

Desktop looks fine, mobile is broken

Lovablebeginner

Lovable Vercel Build Failed

Vercel shows red X on deployment

Lovablebeginner

Lovable Images Work in Preview but Break After Deploy

Broken image icons showing

Lovablebeginner

Why Are My Lovable Credits Running Out So Fast?

Used all monthly credits in a few days

Lovableintermediate

Stripe Checkout Succeeds but Lovable Never Unlocks Access

Checkout succeeds but access is never updated

LovableStripeintermediate

Stripe Shows Active but Lovable Still Blocks Access

Stripe shows the subscription as active

LovableStripeintermediate

Stripe Payment Succeeded but the UI Still Looks Locked

Checkout succeeds but the dashboard still says free plan

LovableStripeintermediate

A User Cancelled Stripe but Still Has Access in the App

A cancelled user still sees premium features

LovableStripeintermediate

Stripe Upgrade Worked but Lovable Still Shows the Old Plan

User upgraded but still sees old limits

LovableStripeintermediate

A Stripe Customer Is Linked to the Wrong User

One user gets another user's access

LovableStripeintermediate

A Cancelled Stripe Subscription Still Has Access in a Lovable App

A user cancelled but still has premium access

LovableSupabaseintermediate

A Lovable Password Reset Link Goes to the Preview URL Instead of Production

Reset password emails send users to a preview URL

Lovableintermediate

A Lovable Role Check Exists Only in the UI

Admin buttons are hidden but direct URLs still work

LovableSupabaseintermediate

A Public Storage Bucket Is Exposing User Files in a Lovable App

User-uploaded files can be opened by anyone with the URL

LovableSupabaseintermediate

A Supabase Read Policy Is Too Broad in a Lovable App

Authenticated users can read more rows than they should

Lovablebeginner

Lovable Supabase Auth Not Working

Users cannot sign in even though the form looks correct

LovableSupabaseintermediate

Supabase RLS Is Exposing User Data in a Lovable App

One user can read another user's rows

LovableStripeintermediate

Users Can Access Paid Features Without Paying in a Lovable App

Premium features unlock without a confirmed Stripe payment

Lovableintermediate

A Secret API Key Is Exposed in the Frontend of a Lovable App

You can see a secret key in the browser source or network tab

LovableSupabaseintermediate

Supabase Storage Bucket Is Public by Mistake in a Lovable App

Private uploads open to anyone with the URL

Lovableintermediate

An Admin Endpoint Is Exposed in a Lovable App

An /api/admin or /admin action works without a proper role check

LovableSupabaseintermediate

A Supabase Service-Role Key Is Exposed in a Lovable App

The browser bundle includes a service_role key

LovableSupabaseintermediate

Anonymous Inserts Are Too Open in a Lovable App

Spam or junk rows flood a public form table

LovableStripeintermediate

Stripe Webhook Replay or Duplicate Events Are Double-Applying Changes

Credits are added twice after one payment

Lovableintermediate

An Admin Dashboard Is Indexed by Google in a Lovable App

An /admin page appears in Google results

Lovablebeginner

Lovable Credits Burning Too Fast

Credits disappear after a handful of prompts

Lovablebeginner

Dark Mode Not Working in Lovable App

Dark mode toggle doesn't change anything

Lovablebeginner

Lovable Form Submits but No Email Ever Arrives

Form submits to the database but no email notification arrives

Lovablebeginner

Lovable Pages Return 404 on Direct URL

Home page works

Lovablebeginner

Lovable Supabase Schema Error

Error: column X does not exist

Lovableintermediate

Lovable App Database Queries Are Slow

Pages with data take 3+ seconds to load

Lovablebeginner

TypeScript Errors in Lovable App

Red underlines in Lovable editor

Lovablebeginner

CSS Changes Not Showing in Lovable

Changed a class but nothing looks different

Lovableintermediate

Lovable App Hitting API Rate Limits

External API returns 429 Too Many Requests

Lovableintermediate

File Upload Not Working in Lovable

Upload button does nothing

Lovableintermediate

Search Feature Not Working in Lovable App

Search returns no results

LovableStripeintermediate

Lovable Checkout Button Throws a Stripe Session 400 Error

The checkout button throws a 400 error

LovableStripeintermediate

Stripe Webhook Returns 200 but Lovable Access Still Does Not Change

Stripe says the webhook succeeded but the user still has no access

LovableSupabaseintermediate

Lovable Supabase RLS Blocking Inserts

Form submits in Lovable but no row appears in Supabase

LovableSupabasebeginner

Lovable Supabase Auth Session Missing After Refresh

User signs in successfully, then gets logged out on refresh

LovableSupabasebeginner

Lovable Supabase Storage Upload Failing

File picker works but the upload fails

LovableStripeintermediate

Lovable Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

LovableStripeintermediate

Lovable Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

LovableStripeintermediate

Lovable Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page

LovableClerkbeginner

Lovable Clerk Middleware Redirect Loop

The app keeps bouncing between login and dashboard

LovableClerkbeginner

Lovable Clerk Production Domain Not Authorized

Authentication works locally but not on the live domain

LovableClerkintermediate

Lovable Clerk Session Missing After Refresh

The user appears signed out after a refresh

LovableResendbeginner

Lovable Resend API Key Missing in Production

Emails work locally but not after deploy

LovableResendbeginner

Lovable Form Submits but No Email Ever Arrives

I filled the form but no email arrived

LovableResendintermediate

Lovable Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam

Bolt Errors

Boltintermediate

npm Package Not Working in Bolt.new

npm install fails with compile errors

Boltbeginner

Bolt.new App Not Deploying

Deploy button doesn't work

Boltbeginner

Bolt.new Forgetting Previous Instructions

Bolt contradicts earlier decisions

Boltbeginner

Bolt Preview Shows the Old Version or Won't Refresh

Bolt.new won't preview the project

Boltbeginner

Bolt.new Daily Credits Exhausted

'Credits exhausted' message

Boltbeginner

Bolt.new Data Not Persisting Between Sessions

Data disappears on page refresh

Boltintermediate

TypeScript Strict Mode Errors in Bolt.new

Red errors throughout the editor

Boltintermediate

CORS Error in Bolt.new App

'Access-Control-Allow-Origin' error in console

Boltbeginner

Bolt.new Styling Looks Different Every Time

New components don't match existing design

Boltbeginner

Bolt Stuck Loading Forever or Spinner Never Stops

Spinner never stops

BoltSupabaseintermediate

Bolt Supabase RLS Blocking Inserts

Form submits in Bolt but no row appears in Supabase

BoltSupabasebeginner

Bolt Supabase Auth Session Missing After Refresh

User signs in successfully, then gets logged out on refresh

BoltSupabasebeginner

Bolt Supabase Storage Upload Failing

File picker works but the upload fails

BoltStripeintermediate

Bolt Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

BoltStripeintermediate

Bolt Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

BoltStripeintermediate

Bolt Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page

BoltClerkbeginner

Bolt Clerk Middleware Redirect Loop

The app keeps bouncing between login and dashboard

BoltClerkbeginner

Bolt Clerk Production Domain Not Authorized

Authentication works locally but not on the live domain

BoltClerkintermediate

Bolt Clerk Session Missing After Refresh

The user appears signed out after a refresh

BoltResendbeginner

Bolt Resend API Key Missing in Production

Emails work locally but not after deploy

BoltResendbeginner

Bolt Resend Emails Not Sending From Contact Form

The contact form succeeds but nobody gets an email

BoltResendintermediate

Bolt Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam

Cursor Errors

Cursorbeginner

Cursor Not Understanding My Codebase

Generic answers that don't match your code

Cursorbeginner

Cursor Changing Files I Didn't Ask It To

Modified 10 files when you asked about 1

Cursorbeginner

Cursor Says Context Limit Reached

'Context window is getting long' warning

Cursorbeginner

Cursor Generating Pages Router Instead of App Router

Creates pages/ instead of app/ files

Cursorintermediate

Cursor Agent Mode Stopping Mid-Task

Agent stops partway through

Cursorbeginner

Cursor Suggestions Arrive Too Late to Use

Tab completions appear after you've typed past them

Cursorbeginner

Cursor Generating Wrong Import Paths

Import paths don't resolve

Cursorintermediate

Cursor MCP Server Not Connecting

MCP tools not appearing in Cursor

Cursorintermediate

Cursor Using APIs That Don't Exist

Generated code calls functions that don't exist

Cursorintermediate

Cursor Agent Mode Is Stuck

Agent mode starts but never finishes

Cursorbeginner

Cursor Project Fails on Vercel Build

The app works locally but Vercel build fails

Cursorintermediate

Cursor Keeps Breaking Working Code While Fixing Something Else

A bug fix breaks unrelated files

CursorSupabaseintermediate

Cursor Supabase RLS Blocking Inserts

Form submits in Cursor but no row appears in Supabase

CursorSupabasebeginner

Cursor Supabase Auth Session Missing After Refresh

User signs in successfully, then gets logged out on refresh

CursorSupabasebeginner

Cursor Supabase Storage Upload Failing

File picker works but the upload fails

CursorStripeintermediate

Cursor Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

CursorStripeintermediate

Cursor Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

CursorStripeintermediate

Cursor Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page

CursorClerkbeginner

Cursor Clerk Middleware Redirect Loop

The app keeps bouncing between login and dashboard

CursorClerkbeginner

Cursor Clerk Production Domain Not Authorized

Authentication works locally but not on the live domain

CursorClerkintermediate

Cursor Clerk Session Missing After Refresh

The user appears signed out after a refresh

CursorResendbeginner

Cursor Resend API Key Missing in Production

Emails work locally but not after deploy

CursorResendbeginner

Cursor Resend Emails Not Sending From Contact Form

The contact form succeeds but nobody gets an email

CursorResendintermediate

Cursor Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam

Deploy Errors

Lovablebeginner

Lovable App Shows a Blank Screen After Deploy

Works in Lovable preview

Lovablebeginner

Lovable Vercel Build Failed

Vercel shows red X on deployment

Lovablebeginner

Lovable Images Work in Preview but Break After Deploy

Broken image icons showing

Lovablebeginner

Lovable Form Submits but No Email Ever Arrives

Form submits to the database but no email notification arrives

Lovablebeginner

Lovable Pages Return 404 on Direct URL

Home page works

Lovablebeginner

TypeScript Errors in Lovable App

Red underlines in Lovable editor

Boltintermediate

npm Package Not Working in Bolt.new

npm install fails with compile errors

Boltbeginner

Bolt.new App Not Deploying

Deploy button doesn't work

Boltbeginner

Bolt Preview Shows the Old Version or Won't Refresh

Bolt.new won't preview the project

Boltintermediate

TypeScript Strict Mode Errors in Bolt.new

Red errors throughout the editor

Boltintermediate

CORS Error in Bolt.new App

'Access-Control-Allow-Origin' error in console

Boltbeginner

Bolt Stuck Loading Forever or Spinner Never Stops

Spinner never stops

Cursorintermediate

Cursor MCP Server Not Connecting

MCP tools not appearing in Cursor

Cursorbeginner

Cursor Project Fails on Vercel Build

The app works locally but Vercel build fails

Vercelbeginner

Vercel Shows a Red X and the Deploy Never Goes Live

Red X on deployment

Vercelbeginner

Works Locally but Vercel Says Environment Variables Are Undefined

App works locally but breaks on Vercel

Vercelbeginner

My Domain Still Will Not Connect to Vercel

Domain still shows 'can't be reached'

Railwaybeginner

Railway Deployment Failing

Deploy fails in Railway

Railwaybeginner

Railway App Crashes After Deploy

Deploy succeeds but app crashes

Cloudflareintermediate

Cloudflare Worker Returning 500 Error

500 Internal Server Error from Worker

Vercelbeginner

My Site Still Says Not Secure After Connecting the Domain

No padlock icon in browser

Vercelbeginner

www Not Redirecting to Non-www

www.domain.com and domain.com show different things

Vercelintermediate

Vercel API Route Works Locally but Times Out in Production

504 Gateway Timeout

Resendintermediate

Resend Emails Going to Spam

Emails arrive in spam folder

LovableResendbeginner

Lovable Resend API Key Missing in Production

Emails work locally but not after deploy

LovableResendbeginner

Lovable Form Submits but No Email Ever Arrives

I filled the form but no email arrived

LovableResendintermediate

Lovable Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam

CursorResendbeginner

Cursor Resend API Key Missing in Production

Emails work locally but not after deploy

CursorResendbeginner

Cursor Resend Emails Not Sending From Contact Form

The contact form succeeds but nobody gets an email

CursorResendintermediate

Cursor Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam

BoltResendbeginner

Bolt Resend API Key Missing in Production

Emails work locally but not after deploy

BoltResendbeginner

Bolt Resend Emails Not Sending From Contact Form

The contact form succeeds but nobody gets an email

BoltResendintermediate

Bolt Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam

Payments Errors

Lovablebeginner

Lovable Stripe Checkout Fails or Cards Are Declined

Payment form shows but card is declined

Lovableintermediate

Stripe Checkout Succeeds but Lovable Never Unlocks Access

Checkout succeeds but access is never updated

LovableStripeintermediate

Stripe Shows Active but Lovable Still Blocks Access

Stripe shows the subscription as active

LovableStripeintermediate

Stripe Payment Succeeded but the UI Still Looks Locked

Checkout succeeds but the dashboard still says free plan

LovableStripeintermediate

A User Cancelled Stripe but Still Has Access in the App

A cancelled user still sees premium features

LovableStripeintermediate

Stripe Upgrade Worked but Lovable Still Shows the Old Plan

User upgraded but still sees old limits

LovableStripeintermediate

A Stripe Customer Is Linked to the Wrong User

One user gets another user's access

LovableStripeintermediate

A Cancelled Stripe Subscription Still Has Access in a Lovable App

A user cancelled but still has premium access

LovableStripeintermediate

Lovable Checkout Button Throws a Stripe Session 400 Error

The checkout button throws a 400 error

LovableStripeintermediate

Stripe Webhook Returns 200 but Lovable Access Still Does Not Change

Stripe says the webhook succeeded but the user still has no access

Stripeintermediate

How to Test Stripe Webhooks Locally

Webhooks work on Stripe but not locally

Stripeintermediate

Stripe Says Webhook Signature Verification Failed

Error: webhook signature verification failed

Stripebeginner

Stripe Payment Succeeds but the User Never Leaves Checkout

Payment succeeds but user stays on Stripe page

Stripeintermediate

Stripe Payment Succeeds but Subscription Status Never Updates

User pays but subscription status not updating

Stripebeginner

Accidentally Charged Real Money in Stripe

Real charges appearing in Stripe

Stripeintermediate

Stripe Customer Portal Link Returns an Error or 404

Portal link returns error

Stripeintermediate

Stripe Payment Form Shows an Error or the Card Keeps Failing

Payment form shows error

Stripebeginner

Stripe Pricing Page Is Empty or Shows No Plans

Pricing page shows nothing

LovableStripeintermediate

Lovable Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

LovableStripeintermediate

Lovable Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

LovableStripeintermediate

Lovable Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page

CursorStripeintermediate

Cursor Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

CursorStripeintermediate

Cursor Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

CursorStripeintermediate

Cursor Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page

BoltStripeintermediate

Bolt Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

BoltStripeintermediate

Bolt Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

BoltStripeintermediate

Bolt Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page