NullReferenceException: Object reference not set to an instance of an object CameraFollow.Update ()

So i have setup a CameraFollow script that enables me to follow my player . But when i destroy the player on gameover , i get this error on the CameraFollow script "NullReferenceException: Object reference not set to an instance of an object CameraFollow.Update ()" i know its because the camera is trying to access the players transform .But how do i fix this error? How do i make the camera stop following player's transform when the player object is destroyed? Here's the CameraFollow Script Code :

using UnityEngine; using System.Collections;

public class CameraFollow : MonoBehaviour {

 public float MinY;
 public float MaxY;

 private Transform Target;

 // Use this for initialization
 void Start ()
 {
   
     Target = GameObject.Find("Player").transform;
 
 }
 
 // Update is called once per frame
 void Update ()
 {
    if (!GameObject.Find("Player").GetComponent<ScoreManager>().PlayerIsDead)
  {

        transform.position = new Vector3(
            Mathf.Clamp(Target.position.x, Target.position.x, Target.position.x),
            Mathf.Clamp(Target.position.y, MinY, MaxY),
            Mathf.Clamp(transform.position.z, transform.position.z, transform.position.z));
    }
   
 }

}