strange and unexpected NullReferenceException error

Unity Engine
1

hello everyone. i have a class as following:

using UnityEngine;
using System.Collections;

public class CheckPointManager : MonoBehaviour {
    public static CheckPointManager instance;

    public GameObject player;
    public bool CP1; // a boolean that returns true if the first checkpoint has benn reached
    public bool CP2;
    public Vector3 CP1SP; // check point 1 spawn position
    public Vector3 CP2SP;
    public float CP1ST; // check point 1 skip time
    public float CP2ST; // check point 2 skip time
   
    AudioSource audioSource;

    // Use this for initialization
    void awake () {
        DontDestroyOnLoad (gameObject);
        instance = this;
        audioSource = player.GetComponent<AudioSource> ();
    }
   
    // Update is called once per frame
    void Update () {
        if (!CP1 && audioSource.time > CP1ST) {
            CP1 = true;
            CP1SP=player.transform.position;
        }
    }
}

i have set the player GameObject in the inspector and i have checked everything on the inspector side and they are good. but still i get the error
“NullReferenceException: Object reference not set to an instance of an object”
when i double click the error it takes me to line 1 of the update function. specifically the problem seems to be invoking audioSource.time.

2

Does the player GameObject have an AudioSource attached? If it doesn’t then it would return null.

3

yes it does. and it is also active

4

Is the AudioSource in a child of the player?

5

i reference audioSource through many scripts without any problem. it is only checkPointManager thats problematic

6

no it is a component of player

7

Your “Awake” is in lowercase and never executing. It’s case sensitive.

1 Like
8

Good catch

9

oops, embarrassing. thanks a lot