32 troubleshooting guides

Lovable Errors and Fixes

Step-by-step fixes for the most common Lovable build, auth, deploy, and integration problems.

Quick Answer

Start with the exact symptom, then verify environment variables, auth redirects, and integration setup before changing code. These 32 Lovable fixes are grouped so you can go straight to the failing workflow.

Featured Lovable fixes

performance

My Lovable App Is Slow

Pages take 3-5 seconds to load

deploy

Lovable App Shows Blank Screen After Deploy

Works in Lovable preview

prompting

Lovable Keeps Changing Things I Didn't Ask It To

Asked to change button color, whole layout changed

database

Lovable Form Data Not Saving to Supabase

Form submits successfully but data doesn't appear in Supabase

auth

Lovable Login Not Working After Deploy

Login works in preview, fails on live URL

payments

Stripe Payments Not Working in Lovable App

Payment form shows but card is declined

All Lovable fixes

beginner

My Lovable App Is Slow

Pages take 3-5 seconds to load

beginner

Lovable App Shows Blank Screen After Deploy

Works in Lovable preview

beginner

Lovable Keeps Changing Things I Didn't Ask It To

Asked to change button color, whole layout changed

beginner

Lovable Form Data Not Saving to Supabase

Form submits successfully but data doesn't appear in Supabase

beginner

Lovable Login Not Working After Deploy

Login works in preview, fails on live URL

beginner

Stripe Payments Not Working in Lovable App

Payment form shows but card is declined

beginner

Lovable App Looks Broken on Mobile

Desktop looks fine, mobile is broken

beginner

Lovable App Build Fails on Vercel

Vercel shows red X on deployment

beginner

Images Not Loading in Lovable App

Broken image icons showing

beginner

Lovable Credits Running Out Too Fast

Used all monthly credits in a few days

beginner

Dark Mode Not Working in Lovable App

Dark mode toggle doesn't change anything

beginner

Contact Form Not Sending Emails in Lovable

Form submits to database but no email notification

beginner

Lovable Pages Return 404 on Direct URL

Home page works

beginner

Lovable Supabase Schema Error

Error: column X does not exist

intermediate

Lovable App Database Queries Are Slow

Pages with data take 3+ seconds to load

beginner

TypeScript Errors in Lovable App

Red underlines in Lovable editor

beginner

CSS Changes Not Showing in Lovable

Changed a class but nothing looks different

intermediate

Lovable App Hitting API Rate Limits

External API returns 429 Too Many Requests

intermediate

File Upload Not Working in Lovable

Upload button does nothing

intermediate

Search Feature Not Working in Lovable App

Search returns no results

Supabaseintermediate

Lovable Supabase RLS Blocking Inserts

Form submits in Lovable but no row appears in Supabase

Supabasebeginner

Lovable Supabase Auth Session Missing After Refresh

User signs in successfully, then gets logged out on refresh

Supabasebeginner

Lovable Supabase Storage Upload Failing

File picker works but the upload fails

Stripeintermediate

Lovable Stripe Checkout Session Returning 400

Stripe checkout creation fails with a 400 error

Stripeintermediate

Lovable Stripe Webhook Not Updating Access

Payment succeeds but the user never gets access

Stripeintermediate

Lovable Stripe Billing Portal Return URL Broken

Stripe Billing Portal opens but returns to a broken page

Clerkbeginner

Lovable Clerk Middleware Redirect Loop

The app keeps bouncing between login and dashboard

Clerkbeginner

Lovable Clerk Production Domain Not Authorized

Authentication works locally but not on the live domain

Clerkintermediate

Lovable Clerk Session Missing After Refresh

The user appears signed out after a refresh

Resendbeginner

Lovable Resend API Key Missing in Production

Emails work locally but not after deploy

Resendbeginner

Lovable Resend Emails Not Sending From Contact Form

The contact form succeeds but nobody gets an email

Resendintermediate

Lovable Resend Emails Going To Spam On Launch

Emails are sent, but they land in spam