How do I solve this nullreference?

I'm following this tutorial: https://www.youtube.com/watch?v=mBGUY7EUxXQ&list=PLX2vGYjWbI0QGyfO8PKY1pC8xcRb0X-nP∈dex=20 in order to make a short stealth level, for now I'm just focusing on the enemy sight. However for some reason the reference to player returns null on line 62: if(Hit.collider == player) Any idea how to fix this? Thanks in advance.

public class EnemySightSC : MonoBehaviour {

 public float fieldOfViewAngle = 110f;
 public bool playerInSight;
 public Vector3 PersonalLastSighting;
 //public GameObject player;
 
 private LastPlayerSighting lastplayersighting;
 private GameObject player;
 private Vector3 previousSighting;
 private SphereCollider col;


 void Awake()
 {
     lastplayersighting = GameObject.FindWithTag("GameController").GetComponent<LastPlayerSighting>();
     player = GameObject.FindWithTag("Player");
     if(player != null)
     {
         Debug.Log("Bread");
     }
     col = GetComponent<SphereCollider>();
     PersonalLastSighting = lastplayersighting.resetPosition;
     previousSighting = lastplayersighting.resetPosition;
 }
 
 // Update is called once per frame
 void Update () {
     if (lastplayersighting.position != previousSighting) 
     {
         if (lastplayersighting.position != previousSighting) 
             PersonalLastSighting = lastplayersighting.position;

         previousSighting = lastplayersighting.position;

         //health
         //if(player.health > 0f)
         // anim.Setbool(hash.playerinsightbool, playerinsight);
         // else anim.SetBool(hash.playerInsightbool, false)
     }

 }
 void OnTriggerStay(Collider other)
 {
     if(other.gameObject == player)
     {
         playerInSight = false;

         Vector3 direction = other.transform.position - transform.position;
         float angle = Vector3.Angle(direction, transform.forward);

         if(angle < fieldOfViewAngle * 0.5f)
         {
             RaycastHit Hit;

             if (Physics.Raycast(transform.position + transform.up, direction.normalized, out Hit, col.radius)) ;
             {
                 if(Hit.collider.gameObject == player)
                 {
                     playerInSight = true;
                     lastplayersighting.position = player.transform.position;
                     Debug.Log("Found you partner!");

                     if(player != null)
                     {
                         return;
                     }
                 }
                 

             }
         }
     }
     
   
 }
 void OnTriggerExit(Collider other)
 {
     if (other.gameObject == player)
         playerInSight = false;
     Debug.Log("where'd you go!?");
 }

}