Audio Source is null when changing scene

Hi, I am new to c# and unity.

I am having an issue where I have an array of audio sources stored on an AudioManager that has "Don't destroy on load".

All the sounds work as intended until I switch scene. Then most of the Audio sources give me an NRE when I call them from other scripts. When I switch back to the starting scene it's back to normal.

I have researched for almost 6 hours now and have found several similar problems, but no solution that either worked or I understood. I do believe that the sound that plays when my character is running is the source of the problem. (but I could be wrong)

I am also testing if Sound s == null and returning if it is, but seems to not do anything

The error I am getting is:

NullReferenceException AudioManager.isPlaying (System.String name) (at Assets/Scripts/AudioManager.cs:65) RunningSound.Update () (at Assets/Scripts/RunningSound.cs:38)

The lines 38 and 65 will be marked in the code down bellow.

Here is the AudioManager script: [code] public class AudioManager : MonoBehaviour {

 public Sound[] sounds;

 public static AudioManager instance;

 // Use this for initialization
 void Awake () {

     if (instance == null)
         instance = this;
     else
     {
         Destroy(gameObject);
         return;
     }

     DontDestroyOnLoad(gameObject);

     foreach (Sound s in sounds)
     {
         s.source = gameObject.AddComponent<AudioSource>();
         s.source.clip = s.clip;

         s.source.volume = s.volume;
         s.source.pitch = s.pitch;
         s.source.loop = s.loop;
     }
 }

 public void Play (string name)
 {
     Sound s = Array.Find(sounds, sound => sound.name == name);
     if (s == null) //---------------line 38-------------------//
     {
         Debug.Log("Sound: " + name + " not found!");
         return;
     }
     s.source.Play();
 }

 public void Stop (string name)
 {
     Sound s = Array.Find(sounds, sound => sound.name == name);
     if (s == null)
     {
         Debug.Log("Sound: " + name + " not found!");
         return;
     }
     s.source.Stop();
 }

 public bool isPlaying(string name)
 {
     Sound s = Array.Find(sounds, sound => sound.name == name);
     if (s == null) 
     {
         Debug.Log("Sound: " + name + " not found!");
         return false;
     }
     return s.source.isPlaying; //----------line 65-----------//
 }

} [/code]

And here is the RunningSound script that might be an issue:

Might also be an inefficient way of determining if the run sound should be played. (I don't know)

[code] public class RunningSound : MonoBehaviour {

 private bool isRunning = false;
 private bool isGrounded;
 private bool groundedLastFrame = false;

 private float runSpeed;
 private AudioManager audioManager;

 private PhysicsObject physicsObjectScript;

 // Use this for initialization
 void Start () {
     GameObject thePlayer = GameObject.FindWithTag("Player");
     physicsObjectScript = thePlayer.GetComponent<PhysicsObject>();
     audioManager = FindObjectOfType<AudioManager>();
 }
 
 // Update is called once per frame
 void Update () {
     isGrounded = physicsObjectScript.grounded;
     runSpeed = Mathf.Abs(Input.GetAxis("Horizontal"));

     //Check if running
     if (runSpeed > 0.01 && isGrounded)
     {
         isRunning = true;
     } else
     {
         isRunning = false;
     }

     //check if run sound is playing
     bool isPlayingRun = audioManager.isPlaying("Run");

     if (isRunning)
     {
         if (!isPlayingRun)
         {
             audioManager.Play("Run");
         }
     }
     else
     {
         if (isPlayingRun)
         {
             audioManager.Stop("Run");
         }
     }

     if (isGrounded && !groundedLastFrame)
     {
         bool isPlayingLand = audioManager.isPlaying("Land");
         bool isPlayingJump = audioManager.isPlaying("Jump");
         //play landing sound
         if (!isPlayingJump && !isPlayingLand)
         {
             audioManager.Play("Land");
         }
     }
     groundedLastFrame = isGrounded;
 }

} [/code]

And lastly the Sound Class I used as template to store the sounds:

[code] [System.Serializable] public class Sound {

 public string name;

 public AudioClip clip;

 [Range(0f, 1f)]
 public float volume;
 [Range(0f, 3f)]
 public float pitch;

 public bool loop;

 [HideInInspector]
 public AudioSource source;

} [/code]

Thanks in advance for any replies. Hopefully I can walk away with a little moe understanding of how all this works.