NullReferenceException with Physics2D raycast

[MarcosLC]

Hi, I’m getting a error with raycasting (Physics 2D). I have this code in a Gun, but I get a NullReferenceException (Object reference not set to an instance of an object)…

This is my script:

using UnityEngine;
using System.Collections;

public class GunRaycast : MonoBehaviour {

	public Transform gunPoint;
	public Transform mirilla;

	public Vector2 mousePos2D;

	public Gun gun;

	void Awake(){
		gun = GetComponent<Gun>();
	}

	void Update () {
		mousePos2D = new Vector2(gun.screenPos.x, gun.screenPos.y);

		RaycastHit2D hit = Physics2D.Raycast(gun.transform.position, mousePos2D);

		if(hit.collider.gameObject.name == "PhysicableSquare"){
			Debug.Log ("PhysicableSquare hit");
		}
	}
}

I don’t know what I’m doing bad, so, Can someone explain me how?

Thanks.

Here a image of the structure of my game:

[idbrii]

The RaycastHit2D’s collider documentation says you can check the result directly (which uses the “implicit conversion operator converting to bool”):

RaycastHit2D result = Physics2D.Linecast(start, end, seeTargetMask);
if (result)
{
    // Find something we can hurt.
    Kill(result.transform.gameObject);
}

I think that’s clearer than checking the collider.

[ziv03]

You’re getting the NullReferenceException because the raycast returns null when there is no collider in the direction.
you can do this:

  if(hit != null)
  {
      if(hit.collider.gameObject.name == "PhysicableSquare"){
          Debug.Log ("PhysicableSquare hit");
      }
  }