Hey guys, I have problem with Next Auth v5, I keep getting error on simple credentials sign in: Failed to construct 'URL' error, only with redirect: false, does anyone see what am I doing wrong?

    const loginUser: SubmitHandler<InputType> = async (data) => {
        const result = await signIn('credentials', {
            redirect: false,
            username: data.email,
            password: data.password
        });
        if (!result?.ok) {
            toast.error(result?.error);
            return;
        }
    };

    Credentials({
            async authorize(credentials) {
                if (!credentials?.email || !credentials?.password) return null;
                const { email, password } = credentials;

                const res = await fetch(process.env.NEXT_PUBLIC_BACKEND_API + '/auth/login', {
                    method: 'POST',
                    body: JSON.stringify({
                        email: email,
                        password
                    }),
                    headers: {
                        'Content-Type': 'application/json'
                    }
                });
                if (!res.ok) {
                    throw new Error('User name or password is not correct');
                }
                const user = await res.json();

                return user;
            }
        })