Ошибка "Object reference not set to an instance of an object" Unity 3d

Помогите выскакивает ошибка:
NullReferenceException: Object reference not set to an instance of an object
IsMine.Start () (at Assets/Scripts/IsMine.cs:15)

Содержимое строки: if (!_photonView.IsMine)
Программа:

using UnityEngine;
using Photon.Pun;

public class IsMine : MonoBehaviour
{

[SerializeField] private PlayerMovement _playerMovement;
[SerializeField] private MouseLook _mouseLook;
[SerializeField] private GameObject _camera;
[SerializeField] private PhotonView _photonView;
[SerializeField] private GameObject _playerModel;

void Start()
{
if (!_photonView.IsMine)
{
_playerMovement.enabled = false;
_mouseLook.enabled = false;
_camera.SetActive(false);
_playerModel.SetActive(true);
}
}

}