Object Reference not Set to an Instance of an Object in C# (Closed)

I have a script detecting if an object has collided with another. I've done some tests by calling other variables between the two scripts (now deleted) and that worked fine, no errors. When tiring to set one variable in the script Stats equal to the called variable from the script RocketDamage I get a NullReferenceExeption.

Stats script (error is on the line "isRocketHit = rocketDamage.rocketHit;")

 using UnityEngine;
 using System.Collections;
 
 public class Stats : MonoBehaviour {
     public int playerControl = 1;
     public float hp = 1002f;
     public float armor = 1005f;
     RocketDamage rocketDamage;
     public float rocketOut;
     float isRocketHit;
     
 
     // Use t$$anonymous$$s for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
         
         //call RocketDamage script because OnTriggerEnter is only allowed once per script
         rocketDamage = GetComponent<RocketDamage>();
         isRocketHit = rocketDamage.rocketHit;
         
         //take dame in returned that $$anonymous$$t is true
         if(isRocketHit == 1){
             hp -= Mathf.Round(100 + (100/(armor+1)));
             armor -= 200;
             //output that damage from rocket has been taken
             rocketOut = 0;
         }
     }
     
     //take damage if $$anonymous$$t by bullet
     void OnTriggerEnter(Collider bullet_basic){
         hp -= Mathf.Round(1 + (1000/(armor+1)));
         if(armor > 0){
             armor -= 5;
         }
     }
 }

RocketDamage script:

 using UnityEngine;
 using System.Collections;
 
 public class RocketDamage : MonoBehaviour {
     
     Stats stats;
     public float rocketHit = 0f;
 
     // Use t$$anonymous$$s for initialization
     void Start () {
         
         //call Stats script
         stats = GetComponent<Stats>();
         
     }
     
     // Update is called once per frame
     void Update () {
         //detect if damage from rocket has been taken
         if(stats.rocketOut == 0){
             rocketHit = 0;
         }
     }
     //detect rocket explosion
     void OnTriggerEnter(Collider explosion_basic){
         rocketHit = 1;
     }
 }

Thanks in advance, I been attempting to debug and Google search answers for hours now.