Infinite Promise.reject() loop when localStorage does not contain username and authProvider.checkAuth rejects

[Nem791]

What you were expecting:
The application should redirect to the login page when no valid credentials (e.g., username) exist in localStorage, and authProvider.checkAuth rejects. Quote from the docs: When checkAuth() throws an error, react-admin redirects to the /login page by default.

What happened instead:
The app enters an infinite redirect (Promise.reject) loop or remains stuck on a blank screen if the username field is not present in localStorage. Manually adding a username entry allows the app to load normally.

Steps to reproduce:

1. Use the examples/demo authProvider where checkAuth checks for a username in localStorage and rejects if missing.
2. Run the app without username in localStorage (fresh start).
3. Observe the redirect loop or blank screen.
4. Manually set localStorage.setItem("username", "admin") and refresh — the app loads correctly.

Related code:

• A link to a GitHub repo with the minimal codebase to reproduce the issue (copy paste from examples/demo)
  • https://github.com/Nem791/tian_fe.git

import { AuthProvider } from 'react-admin';

const authProvider: AuthProvider = {
    login: ({ username }) => {
        localStorage.setItem('username', username);
        // accept all username/password combinations
        return Promise.resolve();
    },
    logout: () => {
        localStorage.removeItem('username');
        return Promise.resolve();
    },
    checkError: () => Promise.resolve(),
    checkAuth: () =>
        localStorage.getItem('username') ? Promise.resolve() : Promise.reject(),
    getPermissions: () => Promise.resolve(),
    getIdentity: () =>
        Promise.resolve({
            id: 'user',
            fullName: 'Jane Doe',
            avatar: 'data:image/jpeg;base64,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',
        }),
};

export default authProvider;

Other information:

Environment

• React-admin version: ^5.0.0
• Last version that did not exhibit the issue (if applicable): N/A
• React version: ^19.0.0
• Browser: Chrome
• Stack trace (in case of a JS error): No visible stack trace; redirect loop observed

[djhi]

I can't reproduce your issue on our demo. With nothing in localStorage, I'm redirected immediately to login page.