Platfomer 2d game block destroying raycasting nullreference exception problem

Questions & Answers
1

Hi, I need a bit of help.

I generate a level and have destroyable blocks in it as well as ai characters that are set up with raycasts onto the solids layer to check different things, like if there is a platform next to them then they can walk left or if not walk right.

I’ve since added the ability to destroy the solids. (platforms and wall blocks).

I get null reference exceptions now from the characters raycasts once a blocks been destroyed (I’m pretty sure that’s whats causing it). I’ve tried real hard to solve this but now don’t know what to do. My raycast script is:

	isPlatLeft = Physics2D.Raycast (new Vector2 (transform.position.x - 1.5f, transform.position.y), new Vector2 (-0.5f, -1), 8f, moveMask);

I’ve got just the walls and platforms and ladders set on the moveMask.

This is where I get the nullreference error:

// check if a platform is under the player and off to the left.
										if (laddCheckLeft) {
												if (laddCheckLeft.collider.tag != null) {
														if (laddCheckLeft.transform.tag == "PLATFORM" || laddCheckLeft.transform.tag == "LaddCollider" || laddCheckLeft.transform.tag == "SOLID") { 
																//	int rane = Random.Range (0, 40);
																nowOffLadder = false;
																//if (rane == 1) {
																laddPlatToLeft = true;
																//}
														} else {
																wasOnLadder = true;
																laddPlatToLeft = false;
														}
												} else {
														wasOnLadder = true;
														laddPlatToLeft = false;
												}
										} else {
												wasOnLadder = true;
												laddPlatToLeft = false;
										}

Everything worked fine until I started destroying blocks.
As you can see I’ve tried to stop it from happening but not sure what to do now and whats going on.

Can someone help PLEASE???

2

This should work

        if (laddCheckLeft)
        {
            Collider2D collider = laddCheckLeft.collider;
            if(collider != null)
            {
                string tag = laddCheckLeft.collider.tag;
                if (tag == "PLATFORM" ||
                    tag == "LaddCollider" ||
                    ltag == "SOLID")
                {
                    //    int rane = Random.Range (0, 40);
                    nowOffLadder = false;
                    //if (rane == 1) {
                    laddPlatToLeft = true;
                    //}
                }
                else
                {
                    wasOnLadder = true;
                    laddPlatToLeft = false;
                }
            }
            else
            {
                wasOnLadder = true;
                laddPlatToLeft = false;
            }
        }
        else
        {
            wasOnLadder = true;
            laddPlatToLeft = false;
        }