Getting MissingReferenceException on Canvas text even though I used DontDestroyOnLoad

Questions & Answers
1

I have a questManager script that uses Singleton Instance. When the quest is complete and the next scene is loaded, I’m getting a MissingReferenceException: The object of type ‘Text’ 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. On the Hierarchy of level02, under DontDestroyOnLoad it shows the canvas and the text so the text shouldn’t be destroyed. What can I check to correct this exception?
Here is my manager script:

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

[System.Serializable]
public class Quest
{
    //Quest completed status
    public enum QUESTSTATUS { UNASSIGNED = 0, ASSIGNED = 1, GATHERED = 2,COMPLETE = 3 };
    public QUESTSTATUS Status = QUESTSTATUS.UNASSIGNED;
    public string QuestName = string.Empty;
}
public class QuestManager : MonoBehaviour
{
    //All quests in game
    public Quest[] Quests;
    private static QuestManager SingletonInstance = null;
    public static QuestManager ThisInstance
    {
        get
        {
            if (SingletonInstance == null)
            {
                GameObject QuestObject = new GameObject("Default");
                SingletonInstance = QuestObject.AddComponent<QuestManager>();
            }
            return SingletonInstance;
        }
    }
    //--------------------------------
    void Awake()
    {
        //If there is an existing instance, then destory
        if (SingletonInstance)
        {
            DestroyImmediate(gameObject);
            return;
        }

        //This is only instance
        SingletonInstance = this;
        Transform parent = GetComponentInParent<Transform>();
        Transform text = parent.GetComponentInChildren<Transform>();
        DontDestroyOnLoad(gameObject);
        DontDestroyOnLoad(text);
    }
    //--------------------------------
    public static Quest.QUESTSTATUS GetQuestStatus(string QuestName)
    {
        foreach (Quest Q in ThisInstance.Quests)
        {
            if (Q.QuestName.Equals(QuestName))
                return Q.Status;
        }

        return Quest.QUESTSTATUS.UNASSIGNED;
    }
    //--------------------------------
    public static void SetQuestStatus(string QuestName, Quest.QUESTSTATUS NewStatus)
    {
        foreach (Quest Q in ThisInstance.Quests)
        {
            if (Q.QuestName.Equals(QuestName))
            {
                Q.Status = NewStatus;
                return;
            }
        }
    }
    //--------------------------------
    //Resets quests back to unassigned state
    public static void Reset()
    {
        if (ThisInstance == null) return;

        foreach (Quest Q in ThisInstance.Quests)
            Q.Status = Quest.QUESTSTATUS.UNASSIGNED;

    }
}
2

@xxmariofer It appears to be happening in the QuestGiver script. Here is the code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class QuestGiver : MonoBehaviour
{
    public string QuestName = string.Empty;
    //Reference to UI Text Box
    public Text Captions= null;
    //List of strings to say
    public string[] CaptionText;

    //--------------------------------

    private void Start()
    {
        Debug.Log(Captions.name);
    }
    void OnTriggerEnter(Collider other)
    {
        if (!other.CompareTag("Player")) return;

        Quest.QUESTSTATUS Status = QuestManager.GetQuestStatus(QuestName);
        Captions.text = CaptionText[(int)Status]; //Update GUI text
        Debug.Log(Status);
        if(Status == Quest.QUESTSTATUS.GATHERED)
        {
            QuestManager.SetQuestStatus(QuestName, Quest.QUESTSTATUS.COMPLETE);
        }
       

    }
    //--------------------------------
    void OnTriggerExit(Collider other)
    {
        Quest.QUESTSTATUS Status = QuestManager.GetQuestStatus(QuestName);
        if (Status == Quest.QUESTSTATUS.UNASSIGNED)
        {
            QuestManager.SetQuestStatus(QuestName, Quest.QUESTSTATUS.ASSIGNED);
            Quest.QUESTSTATUS StatusIs = QuestManager.GetQuestStatus(QuestName);
        }
        Captions.text = " ";
        if (Status == Quest.QUESTSTATUS.COMPLETE)
        {
            SceneManager.LoadScene(1);
        }
        Debug.Log(Captions.name);
}
}

After the quest is complete, after the loading of the new scene. With the debug statement I have there it says QuestText. How do I find what text the exception is referring to. I'm not destroying any text object.