Unable to return custom error message when calling signIn with redirect: false

[EnesArican]

Environment

System:
OS: Linux 5.15 Ubuntu 22.04.4 LTS 22.04.4 LTS (Jammy Jellyfish)
CPU: (4) x64 Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz
Memory: 3.31 GB / 5.73 GB
Container: Yes
Shell: 5.8.1 - /usr/bin/zsh
Binaries:
Node: 20.12.2 - /usr/local/bin/node
npm: 10.5.0 - /usr/local/bin/npm
pnpm: 9.0.6 - /mnt/c/Users/enes/AppData/Roaming/npm/pnpm
npmPackages:
next: 14.2.3 => 14.2.3
next-auth: 5.0.0-beta.18 => 5.0.0-beta.18
react: ^18.2.0 => 18.2.0

Reproduction URL

N/A

Describe the issue

When calling SignIn() method, with the paramete redirect: false , I am not able to return a custom error message.

I have initially attempted to throw a custom error as specified in the documentation. However, I always receive and response with error: CredentialsSignIn.

How to reproduce

Implement providers with custom credentials sign in. Call the SignIn method like so:

const result = await signIn("credentials", { 
      email: data.email,
      password: data.password,
      redirect: false
    });

Throw custom exception inside authorize method:

class InvalidLoginError extends CredentialsSignin {
  code = "Invalid identifier or password"
}
 
export const { handlers, signIn, signOut, auth } = NextAuth({
  providers: [
    Credentials({
        credentials: {
            email: {},
            password: {},
            rememberMe: {},
        },
        authorize: async (credentials) => {
          throw new InvalidLoginError();
}

Expected behavior

Expect to see custom error in sign in response, instead you get error: CredentialsSignIn.

[github-actions]

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Useful Resources

• How to create a Minimal, Complete, and Verifiable example
• Bug report: Framework
• Bug report: Provider
• Bug report: Adapter