Ive seen many of this error solution but i couldnt find any that could help me solve this. Really hope any of you can help. Thank you

MissingReferenceException: The object of type 'GameObject' 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.
ObjectPooler.GetPooledObject () (at Assets/Scripts/ObjectPooler.cs:31)
PlatformGenerator.Update () (at Assets/Scripts/PlatformGenerator.cs:57)

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

public class ObjectPooler : MonoBehaviour
{
    public GameObject pooledObject;

    public int pooledAmount;

    List<GameObject> pooledObjects;

    // Start is called before the first frame update
    void Start()
    {
        pooledObjects = new List<GameObject>();

        for(int i = 0; i < pooledAmount; i++)
        {
            //casting mtd
            GameObject obj = (GameObject) Instantiate(pooledObject);
            obj.SetActive(false);
            pooledObjects.Add(obj);
        }
    }

    public GameObject GetPooledObject()
    {
        for (int i = 0; i < pooledObjects.Count; i++)
        {
            if (!pooledObjects[i].activeInHierarchy)
            {
                return pooledObjects[i];
            }
        }

        GameObject obj = (GameObject)Instantiate(pooledObject);
        obj.SetActive(false);
        pooledObjects.Add(obj);
        return obj;

    }
}










    // Start is called before the first frame update
    void Start()
    {
        //platformWidth = thePlatform.GetComponent<BoxCollider2D>().size.x;
        //to search which of the platform has BC2D with sz

        platformWidths = new float[theObjectPools.Length];

        for(int i = 0; i < theObjectPools.Length; i++)
        {
            platformWidths[i] = theObjectPools[i].pooledObject.GetComponent<BoxCollider2D>().size.x;
        }

    }

    // Update is called once per frame
    void Update()
    {
        if (transform.position.x < generationPoint.position.x)
        {
            distanceBetween = Random.Range (distanceBetweenMin, distanceBetweenMax);

            platformSelector = Random.Range(0, theObjectPools.Length);

            transform.position = new Vector3 (transform.position.x + (platformWidths[platformSelector] / 2) + distanceBetween, transform.position.y, transform.position.z);

            //Instantiate(/* thePlatform */ thePlatforms[platformSelector], transform.position, transform.rotation);

            GameObject newPlatform = theObjectPools[platformSelector].GetPooledObject();

            newPlatform.transform.position = transform.position;
            newPlatform.transform.rotation = transform.rotation;
            newPlatform.SetActive(true);


            transform.position = new Vector3(transform.position.x + (platformWidths[platformSelector] / 2), transform.position.y, transform.position.z);

        }
    }
}

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