score system

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class score : MonoBehaviour {
 
     public int scoreValue;
     public Text scoretext;
     // Use this for initialization
     void Start () {
         scoreValue = 0;
     
     }
     
     // Update is called once per frame
     void Update () {
         scoretext.text = scoreValue.ToString();
     
     }
 
     void OnTriggerEnter2D(Collider2D other)
     {
         if(other.gameObject.tag == "ball")
         {
            scoreValue = scoreValue +1;
         }
     }
 
 }

as you can its a very simple score system ,so what i am trying to achieve her is my ball fall into a bucket with a triger collider soo the bucket is a prefab and the ball is a prefab too these too prefabs are being used many time over and over again ,buckets move below the screen like the pipe in flappy bird,as these are prefab , as i said the bucket is a prefab which randomly generating like the pipes in flappy bird, so after creating my score system i drag and drop the text ui into the given place ,and i apply the changes and delete that prefab and when i go back to asset and check that prefab the given place for text says none.so how can i link the text ui directly to the script so it wont delete it self.

and i have a nullrefrenceexception error in my void update function and i think this error means the same .but i cant figure out how to fix this can some one guide me to the right tutorial or tell me what i am doing wrong here

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