I Got Error on 2nd if statement what is the problem
public void Play()
    {
        ButtonClickSound();
        int sceneNumber = PlayerPrefs.GetInt("LevelNumber");
        if (sceneNumber > 17)
            sceneNumber = Random.Range(2, 18);
        SceneManager.LoadSceneAsync(sceneNumber);   
        if(SceneManager.GetActiveScene().buildIndex != 17)
        {
            CanvasManager.instance.endlessPanel.SetActive(true);
        }
    }
Error is:
Null reference Exception object Reference not set to instance of object
 
    