NullReferenceException: (null)

Questions & Answers
1

This is the code in my GameController script:

public IEnumerator GameStart()
    {
        StartCoroutine(StageOneEnemyRoutine.StartAttack());
        return null;
    }

Here is the code in my StageOneEnemyRoutine script:

public static IEnumerator StartAttack()
    {
        float currentTime = Time.time;
        
        while(Time.time <= currentTime + 120.0f)
        {
            if (portalCount < 2)
            {
                SpawnPortal();
                return null;
            }
            if (GameController.GameIsOver())
                break;
            return null;
        }
        return null;
    }

In the IDE there are no errors and everything compiles correctly. However, when I start the game and reach the point where the Coroutine is called I get the NullReferenceException error on the GameController script.

I have no idea why. Any help?

2

Okay so you should replace all the ‘return null’ with yield break;
That should fix it, it will exit out of the coroutine.

or basically put a yield return null;
An IEnumerator always needs to yield