Trying to get property 'pw_fullname' of non-object

Halo, Saya punya code Laravel 6 seperti ini:

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

Use App\Http\Controllers\Auth\ResetPasswordController;

class SendPasswordPinToUser extends Mailable
{
    use Queueable, SerializesModels;

    public $pwusers;

    /**
     * Create a new message instance.
     *
     * @param $PWUserData
     */
    public function __construct($pwusers)
    {
        $this->pwusers = $pwusers;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
         return $this->subject('New Password and Pin for ' . $this->pwusers->PW_FullName )
            ->view('auth.email.ResetPasswordPin');
    }
}

Setiap di jalan kan, selalu mendapatkan ErrorException: Trying to get property 'PW_FullName' of non-object

Bagaimana cara membuat property 'PW_FullName' menjadi object? supaya bisa saya masukkan ke view blade.

Trims