Unity keeps crashing when 'While' is used...

Hello,

My script is very simple : once the character stops moving, the camera background will change. I don't know why, every time I start the Play mode, Unity crashes.

Here's my script (C#) :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class cameraBackground : MonoBehaviour {
 
     public Color black = Color.black;
     public Camera cam;
     public GameObject character;
 
     // Use this for initialization
     void Start () {
         cam = GetComponent<Camera>();
     }
     
     // Update is called once per frame
     void Update () {
         while(character.GetComponent<Animator>().enabled == false){
                      cam.backgroundColor = black;
         }
     }
 }

Any help would be appreciated.

Thank you and sorry for my English.