“ GameObject”类型的对象已被破坏，但您仍在尝试访问它

Question

So I am working on a runner game and it is almost done. The problem is that I am testing the Pause Panel and when player touches a zombie, pause panel shows up and I am restarting the game again by pressing the restart button. But when I touch the zombie again panel doesnt show up and gives me the error in the title. I am stuck and any help will be appreciated. This is the code and I referenced to the line that error sends me :

[SerializeField]
private GameObject pausePanel;

[SerializeField]
private Button RestartGameButton;

[SerializeField]
private Text ScoreText;

private int score;

void Start ()
{
    pausePanel.SetActive(false);
    ScoreText.text = score + "M";
    StartCoroutine(CountScore());
}

IEnumerator CountScore()
{
    yield return new WaitForSeconds(0.6f);
    score++;
    ScoreText.text = score + "M";
    StartCoroutine(CountScore());
}

void OnEnable()
{
    PlayerDeath.endgame += PlayerDiedEndTheGame;
}

void OnDisable()
{
    PlayerDeath.endgame += PlayerDiedEndTheGame;
}

void PlayerDiedEndTheGame()
{
    if (!PlayerPrefs.HasKey("Score"))
    {
        PlayerPrefs.SetInt("Score", 0);
    }
    else
    {
        int highscore = PlayerPrefs.GetInt("Score");

        if(highscore < score)
        {
            PlayerPrefs.SetInt("Score", score);
        }
    }

    pausePanel.SetActive(true); //this is the line that error sends me but I cant figure it out because I didnt try to destroy the panel in the first place.
    RestartGameButton.onClick.RemoveAllListeners();
    RestartGameButton.onClick.AddListener(() => RestartGame());
    Time.timeScale = 0f;
}

public void PauseButton()
{
    Time.timeScale = 0f;
    pausePanel.SetActive(true);
    RestartGameButton.onClick.RemoveAllListeners();
    RestartGameButton.onClick.AddListener(() => ResumeGame());
}

public void GoToMenu()
{
    Time.timeScale = 1f;
    SceneManager.LoadScene("MainMenu");
}

public void ResumeGame()
{
    Time.timeScale = 1f;
    pausePanel.SetActive(false);
}

public void RestartGame()
{
    Time.timeScale = 1f;
    SceneManager.LoadScene("Gameplay");
}

Answer 1

I found the solution. It was a simple mistake on the OnDisable method. I deleted the += sign and changed it with -= sign because it was enabling the event when it was supposed to disable.