GetComponent returns null

Hi im getting this really annoying problem that appears from no where. I have been developing this game for a really long time and suddenly a method that i have stop working and tells me that the getComponent that return the script from an object is null despite that i see that its working on the inspector.

here it is:

using UnityEngine; using System.Collections;

public class ScrCoger : MonoBehaviour {

 private GameObject antorcha;

 void Start(){
     antorcha = GameObject.FindGameObjectWithTag ("Antorcha");
 }

 void OnTriggerStay2D(Collider2D temp){
     if(temp.gameObject.tag == "Player" && Input.GetKeyDown(KeyCode.R)){
                     antorcha.GetComponent<ScrAntorcha>().activarAntorcha();
         this.gameObject.SetActive(false);
     }
 }

}

So antorcha as a gameobject is not null but the "antorcha.GetComponent()" returns null and i dont know why in the past month this code was working.

So if anyone have an idea of what its happening please tell me. I appreciate anyone help. Sorry for my english, its not my native language, thanks.