NullReferenceException after updating Unity

Hey guys! I just updated Unity and tried to play game in editor but it gives me this error: NullReferenceException: Object reference not set to an instance of an object UILoadScreen.Update () (at Assets/Scripts/MainMenu/UILoadScreen.cs:24)

I've tried to fix this but no luck.

Scripts:

UILoadScreen

 using UnityEngine;
 using UnityEngine.UI;
 
 public class UILoadScreen : MonoBehaviour {
 
     public GameObject loadScreen;
     public Slider loadingBar;
     public Text loadPercent;
 
     public float percentage;
 
     LoadNewScene scene;
 
     void Start () {
         scene = FindObjectOfType<LoadNewScene> ();
     }
 
     void Update () {
 
         if (scene.loading) {
             loadScreen.SetActive (true);
         }
 
         loadingBar.value = scene.aSync.progress;
         percentage = scene.aSync.progress / loadingBar.maxValue * 100;
         loadPercent.text = percentage.ToString ("F0") + "%";
 
         if (scene.aSync.isDone) {
             loadScreen.SetActive (false);
         }
     }
 }
 

LoadNewScene

 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 public class LoadNewScene : MonoBehaviour {
 
     public string sceneName;
 
     public AsyncOperation aSync;
 
     [HideInInspector]
     public bool loading;
 
     public void LoadScene () {
 
         aSync = SceneManager.LoadSceneAsync (sceneName);
         loading = true;
     }
 }
 

Can someone help? :(