NullReferenceException when starting the project, although everything is fine?

Question

Unity

The object is bound, nothing is included in the trigger

public class ShopSlot : MonoBehaviour
{
    [SerializeField]
    private GameObject shipPrefab;
    private MoveShip moveShip;

    private void OnTriggerEnter2D(Collider2D coll)
    {
        moveShip = coll.gameObject.GetComponent<MoveShip>();
        moveShip.vector3Slot = new Vector3(gameObject.transform.position.x, gameObject.transform.position.y, gameObject.transform.position.z);
    }
    private void OnTriggerExit2D(Collider2D collision)
    {
        moveShip.vector3Slot = Vector3.zero;
        Debug.Log(moveShip.vector3Slot);
    }
}

Answer 1

I did a check on the tag, there are no errors, but it's still interesting because of what it was