Audiosource Error with Unity prefabs

Question

I made some Prefab and put some of them on the scene while running a script.

The script is responsible for destroying the enemy when a player steps on a Colisor in his head (that Colisor is the enemy’s son).

Here is the enemy script (Frog):

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Frog : MonoBehaviour
 {
     private Rigidbody2D rig;
     public Animator anim;
 
     public float speed;
 
     public Transform upside; // Parte superior de colisão contra objetos. (Só comentei para vocês não se confundirem, pode ignorar isso.)
     public Transform underside; // Parte inferior de colisão contra objetos. (Só comentei para vocês não se confundirem, pode ignorar isso.)
 
     private bool colliding;
 
     public LayerMask layer;
 
     public AudioSource audioSource;
 
     public static Frog frog;
 
     // Start is called before the first frame update
     void Start()
     {
         rig = GetComponent<Rigidbody2D>();
         anim = GetComponent<Animator>();
 
         frog = this;
     }
 
     // Update is called once per frame
     void Update()
     {
         rig.velocity = new Vector2(speed, rig.velocity.y);
 
         colliding = Physics2D.Linecast(upside.position, underside.position, layer); // Cria uma linha invisível na frente do inimigo para fazer um colisor. (Só comentei para vocês não se confundirem, pode ignorar isso.)
 
         if(colliding) // Se colidiu com algo... (Só comentei para vocês não se confundirem, pode ignorar isso.)
         {
             transform.localScale = new Vector2(transform.localScale.x * -1f, transform.localScale.y); // ...inverte o inimigo; e, (Só comentei para vocês não se confundirem, pode ignorar isso.)
             speed = -speed; // inverte a velocidade. (Só comentei para vocês não se confundirem, pode ignorar isso.)
         }
     }
 
     void OnCollisionEnter2D(Collision2D coll)
     {
         if(coll.gameObject.tag == "Player" && !FrogCollision.frogColl.isFrogDead)
         {
             audioSource.clip = Player.instance.deathClip;
             audioSource.Play();
 
             GameController.instance.ShowGameOver();
             Destroy(coll.gameObject);
         }
     }
 }

And this is the script of the Son Researcher (Frogcollision):

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class FrogCollision : MonoBehaviour
 {
     public AudioClip frogDeath;
     public bool isFrogDead;
 
     public static FrogCollision frogColl;
 
     void Start()
     {
         frogColl = this;
     }
 
     void OnCollisionEnter2D(Collision2D coll)
     {
         if(coll.gameObject.tag == "Player")
         {
             Frog.frog.audioSource.clip = frogDeath;
             Frog.frog.audioSource.Play();
 
             coll.gameObject.GetComponent<Rigidbody2D>().AddForce(Vector2.up * 10, ForceMode2D.Impulse);
             Frog.frog.speed = 0;
 
             Frog.frog.anim.SetTrigger("isDead");
             Destroy(Frog.frog.gameObject, 0.3f);
 
             isFrogDead = true;
         }
     }
 }

The problem is when I step on an enemy with several enemies in the same scene. The trampled enemy is not destroyed, but another.

So, I keep stepping on the enemy and gives this error on the console:

Missingreferenceexception: The Object of type 'Audiosource' has been destroyed but you are still trying to access it. Your script should either check if it is null or you should not Destroy the Object. Frogcollision.Oncollisionenter2d (Unityengine.Collision2d Coll) (at Assets/Scripts/Frogcollision.Cs:21)

Could someone help me, please?

Answer 1

It turns out that Voce is not destroying the object on which it is colliding, it would be more practical to create an "Enemy" tag and put in the Frogs and then already put a script player collision with the enemy, but Voce does the opposite and ends up destroying the other object when it collides. Try to leave your Frogcollision script like this:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class FrogCollision : MonoBehaviour
{
    public AudioClip frogDeath;
    public bool isFrogDead;
 
    public static FrogCollision frogColl;
 
    void Start()
    {
        frogColl = this;
    }
 
    void OnCollisionEnter2D(Collision2D coll)
    {
        if(coll.gameObject.tag == "Player")
        {
            AudioSource frogAud = this.transform.parent.gameObject.GetComponent<AudioSource>();
            frogAud.clip = frogDea
            frogAud.Play();
 
            coll.gameObject.GetComponent<Rigidbody2D>().AddForce(Vector2.up * 10, ForceMode2D.Impulse);
            Frog.frog.speed = 0;

            Frog.frog.anim.SetTrigger("isDead");
            Destroy(this.transform.parent.gameObject, 0.3f);
 
            isFrogDead = true;
        }
    }
}