SetActive function not working

Hi there,

A new problem has just appeared in my code. In OnTriggerEnter i'm testing if the player collides with the obstacle. When I tell the script to display a message it works fine. But when I replace the Debug.Log("test"), with: deadScreen.gameObject.SetActive(true) to enable my death screen, it just dosen't work and I don't know why. Any help would be appreciated. Thanks in advance.

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Here's my CollisionWithObstacle script that's attached to my obstacle:⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
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 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class CollisionWithObstacle : MonoBehaviour
 {
     public GameObject deadScreen;
     private bool isShown = false;
     public static bool alive = true;
     void Start()
     {
         isShown = false;
     }
 
     private void OnTriggerEnter(Collider other)
     {
         alive = false;
     }
 
     private void Update()
     {
         if (!alive)
         {
             deadScreen.SetActive(true);
             deadScreen.active = true;
             isShown = true;
         }
     }   
 }