NullReferenceException in my PlayerController

For some reason, I’m getting a NullReferenceException error in my Die(). The specific error text from the Start Screen is:

“NullReferenceException: Object reference not set to an instance of an object PlayerController.Die() (at Assets/Scripts/PlayerController.cs:33)”

Can anyone help me figure out what I’ve done wrong? I’ve been looking at this for probably 2 hours and it looks exactly like the instructor’s code to me.

Here is the code, with the Die() bolded.:

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour 
	public float speed;
	public float padding = 1f;
	public GameObject projectile;
	public float projectileSpeed;
	public float firingRate = 0.2f;
	public float health;

	private float xmin;
	private float xmax;

	public AudioClip fireSound;

	void OnTriggerEnter2D(Collider2D collider){
		Projectile missile = collider.gameObject.GetComponent<Projectile>();
			Debug.Log ("Player Collided with missile");
			health -= missile.GetDamage();
			if (health <= 0) {
	void Die(){
		LevelManager levelManager = GameObject.Find("LevelManager").GetComponent<LevelManager>();
		levelManager.LoadLevel("End Screen");
	void Start(){
		float distance = transform.position.z - Camera.main.transform.position.z;
		Vector3 leftmost = Camera.main.ViewportToWorldPoint(new Vector3(0,0,distance));
		Vector3 rightmost = Camera.main.ViewportToWorldPoint(new Vector3(1,0,distance));
		xmin = leftmost.x + padding;
		xmax = rightmost.x - padding;
	void Fire(){
		GameObject beam = Instantiate(projectile, transform.position, Quaternion.identity) as GameObject;
		beam.rigidbody2D.velocity = new Vector3(0, projectileSpeed, 0);
		AudioSource.PlayClipAtPoint(fireSound, transform.position);

	void Update () {
			InvokeRepeating("Fire", 0.0001f, firingRate);
			transform.position += Vector3.left * speed * Time.deltaTime;
		}else if (Input.GetKey(KeyCode.RightArrow)){
			transform.position += Vector3.right * speed * Time.deltaTime; 
		// restrict the player to the gamespace
		float newX = Mathf.Clamp(transform.position.x, xmin, xmax);
		transform.position = new Vector3(newX, transform.position.y, transform.position.z);

Hi @keirankozlowski,

How is yourlevel manager game object in the hierarchy spelt (including its cAsE etc)?

It’s called LevelManager.


Ok, so you should be getting a level manager object back with your code.

Lets check… in your current Die() method;

	void Die(){
		LevelManager levelManager = GameObject.Find("LevelManager").GetComponent<LevelManager>();
		levelManager.LoadLevel("End Screen");

…can you change it to this, just for a test;

	void Die(){
		LevelManager levelManager = GameObject.Find("LevelManager").GetComponent<LevelManager>();
		Debug.Log("Level Manager : " + levelManager);
		// levelManager.LoadLevel("End Screen");
		// Destroy(gameObject);

You will get something output to the console when you die, the level will not change, can you take a screenshot with the information in the console please and post it.

Hi Rob,

Thanks for your help; the act of taking a screencap for you made me realize I’m an idiot and somehow didn’t place a LevelManager prefab in the game scene at all, but I did in the other two scenes for some reason. Classic newbie mistake!


1 Like

Hi Keiran,

Glad to hear you have resolved the issue.

Don’t beat yourself up, we all make little mistakes from time to time and are often too close to it to see the problem :slight_smile:

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