SupabaseUrl is required when deploy on Vercel (urgent)

I use Supabase and SvelteKit Supabase Auth helper to deal with my auth and data access. When in local, everything is working fine. The deploy on Vercel works, but when I access to the site, I get infinite loading, because I get an error: SupabaseURL is required. My env vars are defined (PUBLIC_SUPABASE_URL and PUBLIC_SUPABASE_ANON_KEY).

Any idea?