Null reference exception when starting a coroutine

Questions & Answers
1

I’m not sure what I am doing wrong here, as all references are set in the inspector. The coroutine starts and waits the correct time but, Its giving me this error at the if statement:

NullReferenceException: Object reference not set to an instance of an object
EnemySpawner+<SpawnCycle>d__6.MoveNext () (at Assets/Scripts/LevelElements/EnemySpawner.cs:23)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <1332c534a8a44623b2e5cc943a0b790e>:0)

This is my code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemySpawner : MonoBehaviour
{
    public bool canSpawn;
    public GameObject enemyToSpawn;
    public float spawnRate;
    public int maxEnemies;
    private List<GameObject> myEnemies;
    void Start()
    {
        if (canSpawn)
        {
            StartCoroutine("SpawnCycle");
        }
    }

    private IEnumerator SpawnCycle()
    {
        yield return new WaitForSeconds(spawnRate);
        if (myEnemies.Count < maxEnemies && canSpawn)
        {
            GameObject newEnemy = Instantiate(enemyToSpawn, transform.position, transform.rotation);
            myEnemies.Add(newEnemy);
            Debug.Log("Spawned Enemy. My enemy count: " + myEnemies.Count + " out of " + maxEnemies);
            StartCoroutine("SpawnCycle");
        }
        else
        {
            Debug.Log("Did not spawn enemy. My enemy count: " + myEnemies.Count + " out of " + maxEnemies);
            StartCoroutine("SpawnCycle");
        }

    }
}

Help would be apricated :slight_smile:

2

I set my list from private to public and its working now. I don’t understand why though.