NullReferenceException - When destroying Object

Hello there! I have a problem, i am getting an "NullReferenceException".. And i do not see why, it says its at line 45. Which makes no sense at all.. Everything worked before i added the "Destroy(targetobj);" :-)

Here is my code:

 using UnityEngine;
 using System.Collections;
 
 public class PickupItem : MonoBehaviour
 {
     public GameObject player;
     public string searchTag = "Item";
     public Transform target;
     public GameObject targetobj;
     public bool item_visible = false;
     public float distancemax = 2;
     
     // Use this for initialization
     void Start ()
     {
         player = GameObject.FindGameObjectWithTag ("Player");
     }
     
     // Update is called once per frame
     void Update ()
     {
         
         
     
         if (Input.GetButtonDown ("Use")) {
             
             ScanForTarget (false);
             
             item_visible = target.renderer.isVisible;
             
             float distance = Vector3.Distance (player.transform.position, target.transform.position);
         
             
             Debug.Log ("" + target + " Position: " + target.transform.position + " Player Position: " + player.transform.position + " Distance: " + distance);
                 
             if (distance < distancemax && item_visible == true) {
                 
                 Debug.Log ("'E' PRESSED @Item");
                 Debug.Log ("targetobj = " + targetobj.ToString ());
                 Destroy (targetobj);
                 MyPlayer.MyInventory.Add (new Item ("T-I", 0));
             
             }
         
         }
     }
     
     void ScanForTarget (bool debug)
     {
         
         target = GetNearestTaggedObject (debug);
         targetobj = target.gameObject;
 
     }
 
     Transform GetNearestTaggedObject (bool debugging)
     {
         
 
         float nearestDistanceSqr = Mathf.Infinity;
         GameObject[] taggedGameObjects = GameObject.FindGameObjectsWithTag (searchTag); 
         Transform nearestObj = null;
 
         
         foreach (GameObject obj in taggedGameObjects) {
 
             Vector3 objectPos = obj.transform.position;
             float distanceSqr = (objectPos - transform.position).sqrMagnitude;
 
             if (distanceSqr < nearestDistanceSqr) {
                 nearestObj = obj.transform;
                 nearestDistanceSqr = distanceSqr;
             }
         }
         
         if (debugging == true) {
         
             Debug.Log (nearestObj);
         }
         return nearestObj;
     }
     
 }
 

Full error message: NullReferenceException: Object reference not set to an instance of an object at ToolTipHandler.Update ()

Thanks!

• Frederik