How to loop through a list of sounds if(bool)

Questions & Answers
1

UPDATE: I fixed the error. audioSource = GetComponent<AudioSource>() is called in Start() but I Start() is never executed I guess. The following works:

 public void PlaySound()
     {
         audioSource = GetComponent<AudioSource>()
         PlayList();
     }

QUESTION: I have the script below attached to gameobject with a audiosource. When a condition is true, I call the function PlaySound() through another script (and when false I call StopSound()). But this isn’t working. I get the error:

NullReferenceException: Object reference not set to an instance of an object
PlayEatingSounds.PlayList () (at Assets/Scripts/PlayEatingSounds.cs:30)

At line 30: audioSource.clip = audioClips[Random.Range(0, audioClips.Count)];
The list with audioclips is definitely not empty.
I have 0 clues or google results in how to tackle this, please help.

public class PlayEatingSounds : MonoBehaviour
{
    public Vector2 pitchRange;
    public List<AudioClip> audioClips = new List<AudioClip>();

    private AudioSource audioSource;
    private AudioClip audioClip;

    void Start()
    {
        audioSource = GetComponent<AudioSource>();
    }

    public void PlaySound()
    {
        PlayList();
    }

    public void StopSound()
    {
        CancelInvoke();
    }

    void PlayList()
    {
        audioSource.clip = audioClips[Random.Range(0, audioClips.Count)];
        audioSource.pitch = Random.Range(pitchRange.x, pitchRange.y);
        audioSource.Play();
        Invoke("PlayList", audioSource.clip.length);
    }
}
2

if The list with audioclips is not empty, maybe audioSource is empty? Try to specify it in the inspector instead GetComponent