Destroy Works, But Transform Doesn't?

Unity Engine
1

I keep getting a NullReferenceException on line 17 (the first IF statement), but only when I use transform instead of destroy. I prefer using transform to move objects into an area where a different script destroys them so that OnTriggerExit will work for the objects in their vicinity. However, I’m getting this really strange behavior where if I use “Destroy(gameObject);” I won’t get an error at all, but if I use any version of the commented code on lines 19-21 OR 27-29 I get an error in my IF statement on line 17 (even when I only change the code in the lower IF statement.

The explicit error is:

NullReferenceException: Object reference not set to an instance of an object
Arrow.OnTriggerEnter (UnityEngine.Collider other) (at Assets/Scripts/Used/Arrow.cs:17)

Any help would be greatly appreciated, every component of this code seems to work fine in other scripts. I feel like I’m taking crazy pills.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Arrow : MonoBehaviour {

    private float speed= 3;

   void Update ()
    {
        transform.Translate(Vector3.right * speed * Time.deltaTime);
        Debug.Log(transform.position);
    }
    void OnTriggerEnter(Collider other)
    {
        if (other.GetComponent<Tags>().hasTag("Wall") && other.CompareTag(this.tag))
        {
            //gameObject.transform.position = new Vector3(5f, -2f, 5f);
            //this.transform.position = new Vector3(5f, -2f, 5f);
            //transform.position = new Vector3(5f, -2f, 5f);
            Destroy(gameObject);
        }
        if (!other.CompareTag(this.tag) && other.GetComponent<Unit_Health>() != null)
        {
            other.GetComponent<Unit_Health>().AdjustHealth(-1);
            //gameObject.transform.position = new Vector3(5f, -2f, 5f);
            //this.transform.position = new Vector3(5f, -2f, 5f);
            //transform.position = new Vector3(5f, -2f, 5f);
            Destroy(gameObject);
            Debug.Log("Arrow attack");
        }
    }
}
2

if (other.GetComponent().hasTag(“Wall”) && other.CompareTag(this.tag))
there is no component tag on your gameobject. Tag is one variable from gameobject.

if (other.gameObject.tag == "Wall"
3

Sorry, I should have included this script, that portion of the IF statement is actually referencing this script which I attach to everything to handle multiple tags. Given this, I think that portion of the code is ok, but please let me know if I’m wrong! Thanks for the reply!

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Tags : MonoBehaviour
{
    private List<string> myTags = new List<string>();

    public bool hasTag (string tagToCheck)
    {
        foreach(string tag in myTags)
        {
            if(tagToCheck == tag)
            {
                return true;
            }
        }
        return false;
    }
    public void addTag (string tagToAdd)
    {
        myTags.Add(tagToAdd);
    }

}
4

sorry, my wrong :frowning:

can you comment 24 - 32 ? and test with transform ? Can it be, that you teleport object from the trigger and then the second if statement can get null, because your object is not in trigger ?

5

I’m not sure why exactly, but I removed “Is Trigger” from my Arrow collider prefab and now I don’t get any errors. Appreciate the help, vakabaka!