Error trying to add default user role to newly registered users in Fortify

I'm trying to give new users the default role of user when they register. I changed return User::create to $user = User::create([ otherwise the role wont attach, but now i get this error. and i cant figure out how to solve this.

Argument 1 passed to Illuminate\Auth\SessionGuard::login() must implement interface Illuminate\Contracts\Auth\Authenticatable, null given, called in /Users/username/code/jetstream/vendor/laravel/fortify/src/Http/Controllers/RegisteredUserController.php on line 56

<?php

namespace App\Actions\Fortify;

use App\Models\User;
use App\Models\Role;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;
use Illuminate\Auth\Events\Registered;
use Laravel\Fortify\Contracts\CreatesNewUsers;

class CreateNewUser implements CreatesNewUsers
{
    use PasswordValidationRules;

    /**
     * Validate and create a newly registered user.
     *
     * @param  array  $input
     * @return \App\Models\User
     */
    public function create(array $input)
    {
        Validator::make($input, [
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
            'password' => $this->passwordRules(),
        ])->validate();

        $user = User::create([
            'name' => $input['name'],
            'email' => $input['email'],
            'password' => Hash::make($input['password']),
        ]);

        $role = Role::select('id')->where('name', 'user')->first();

        $user->roles()->attach($role);

    }
}