Auth session missing — getSession() returns null

Supabase can’t find the user’s session.

Fix 1: Check your Supabase client setup

// ❌ Creating a new client on every request
const supabase = createClient(url, key);

// ✅ Use createServerClient for SSR
import { createServerClient } from '@supabase/ssr';
const supabase = createServerClient(url, key, { cookies });

Fix 2: Check cookie configuration

// Next.js middleware
const supabase = createServerClient(url, key, {
  cookies: {
    get: (name) => request.cookies.get(name)?.value,
    set: (name, value, options) => response.cookies.set({ name, value, ...options }),
    remove: (name, options) => response.cookies.set({ name, value: '', ...options }),
  },
});

Fix 3: Refresh the session

const { data: { session } } = await supabase.auth.getSession();
if (!session) {
  const { data } = await supabase.auth.refreshSession();
}