I’m making a multiplayer game in unity using Netcode for Gameobjects. I allowed each player to have their own camera that follows them. The system worked fine.

However, when I disabled it to do some debugging for something else, and then reenabled it, suddenly I get an error, because the camera holder variable isn’t assigned:
“NullReferenceException: Object reference not set to an instance of an object
CamController.Start () (at Assets/Scripts/CamController.cs:19)”
and
“NullReferenceException: Object reference not set to an instance of an object
CamController.FixedUpdate () (at Assets/Scripts/CamController.cs:31)”

The thing is, I want that variable to be assigned in the code, when the player instantiates their own camera holder. I can’t set it to private, because I need another script to access it, and I can’t make it local, because multiple functions need it.

Here are the scripts (they’re both assigned to the player):

using System.Collections;
using System.Collections.Generic;
using Unity.Netcode;
using UnityEngine;

public class Player : NetworkBehaviour
{
    private Rigidbody playerRb;
    public GameObject camHolderPrfb;
    public GameObject camHolder;
    public float speed;
    public float jumpForce;
    public float gravityMod;
    private bool onGround = true;

    void Start()
    {
        camHolder = Instantiate(camHolderPrfb, transform.position, Quaternion.identity);
        playerRb = GetComponent<Rigidbody>();
        Physics.gravity *= gravityMod;
    }

    void Update()
    {
        //Makes sure player can only control its character
        if (!IsOwner) {enabled = false;} 
        //Calculates player movement
        float forwInput = Input.GetAxis("Vertical");
        float horzInput = Input.GetAxis("Horizontal");
        Vector3 direction = camHolder.transform.forward * forwInput + camHolder.transform.right * horzInput;
        //Applies movement to player
        if (direction.magnitude > 1) {direction.Normalize();}
        playerRb.AddForce(direction * speed);
        
        //Allows player to jump
        if(Input.GetKeyDown(KeyCode.Space) && onGround) {
            onGround = false;
            playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
        }
    }
    
    //Ensures player can only jump if it's touching the ground
    void OnCollisionEnter(Collision collision) 
    {
        if (collision.gameObject.CompareTag("Ground")) {
            onGround = true;
        }
    }
}

Second:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using Unity.Netcode;

public class CamController : NetworkBehaviour
{

    public float rotationSpeed;
    public float lerpSpeed;
    public GameObject camHolder;
    private Camera playerCamComp;
    private GameObject playerCam;
    public Player PlayerScr;

    void Start() 
    {
        camHolder = PlayerScr.camHolder;
        playerCamComp = camHolder.GetComponentInChildren<Camera>();
        playerCam = playerCamComp.gameObject;
    }

    void FixedUpdate()
    {
        //Camera is rotatable with left and right keys
        float camInput = Input.GetAxis("MoveCam");
        camHolder.transform.Rotate(Vector3.up, camInput * Time.deltaTime * rotationSpeed);
        //Camera moves and looks at the player
        camHolder.transform.position = Vector3.Lerp(camHolder.transform.position, transform.position, lerpSpeed * Time.deltaTime);
        playerCam.transform.LookAt(this.transform);
    }
}

Aside from what I mentioned earlier, I also tried initially assigning some other random prefab that I created for this purpose, but it didn’t work.