how do I fix this one time bug.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using Pathfinding;
5.  
6. public class Enemy : MonoBehaviour
7. {
8.     private AIDestinationSetter aiDestSetterScript;
9.     private GameObject player;
10.  
11.     void Start()
12.     {
13.         //Sets AI destination of enemy on player
14.         aiDestSetterScript = GetComponent<AIDestinationSetter>();
15.         player = GameObject.Find("Player");
16.         aiDestSetterScript.target = player.GetComponent<Transform>();
17.     }
18.  
19.     // If there is no player destroy enemy
20.     private void FixedUpdate()
21.     {
22.         if (player == null)
23.         {
24.             Destroy(gameObject);
25.         }
26.     }
27.  
28.     // Enemy destroys player and himself on collision with player
29.     private void OnCollisionEnter2D(Collision2D collision)
30.     {
31.         if (collision.gameObject.CompareTag("Player"))
32.         {
33.             Destroy(collision.gameObject);
34.             Destroy(gameObject);
35.         }
36.     }
37. [LIST]
38. [*]In this script the line 16 is giving error that object reference not set to an instance of an object if
39. [*]while playing my player dies.
40. [*]it gives only one error bcz of one enemy creted who doesnt have anywhere to go.
41. [*]how to fix this??
42. [/LIST]

 

Is your player object in the hierarchy named "Player" ? Though it looks like it's in start you might be running into situation that the player isn't even created yet. I believe one solution is make private GameObject player public, scene window, select object with the Enemy script and then drag the player object over to the variable referenced in the inspector. another method I've used is FindWithTag, have to set the tag on the player object to "Player"

 

Actually the error is caused in line 16 bcz when the enemy is instantiated the target is set to player, but if enemy has been instantiated and player dies then the ai target field becomes null and gives null reference exception
I need a fix for this