Redirection failure on captcha

I am using the laravel registration form. On the RegisterController I am checking the response body. On captcha failure, I am trying to redirect the user to the register page. Pretty simple right? Here is the code

  $response  = Zttp::asFormParams()->post('https://www.google.com/recaptcha/api/siteverify',[
            'secret' => config('services.recaptcha.secret'),
            'response' => $data['g-recaptcha-response'],
            'remoteip' => $_SERVER['REMOTE_ADDR']
        ]);
        
        $response_body = json_decode($response->getBody(), true);
        
        
        if($response_body['success'] == false){ // redirect and abort
    
            
            return redirect()->route('register');
        }

On the captcha failure instead of simpy redirecting, it throws the following error:

Argument 1 passed to Illuminate\Auth\SessionGuard::login() must implement interface Illuminate\Contracts\Auth\Authenticatable, instance of Illuminate\Http\RedirectResponse given, called in 

I just want to redirect to the register page