Infinite loop being caused by instantiating through an if statement

This is a hard one and I am having a tough time just formulating the question. Sorry in advance for the bad looking code and for possible noob mistakes, I am mostly self-taught.

I'm building a terrain generator based on 2D blocks. The expected behaviour is that I'm placing a column of blocks and then each one of the blocks has a script based on if statements to automate the creation of a hill like structure. So each one of the blocks checks if it has an upper block, then a right and a left block. If an upper block exists and no right or no left block exist then a right or a left block is created. I am doing this using raycasthits, if the raycast hits a collider then it knows there is a block.

What is hapenning right now is that I cannot for the life of me get rid of a loop that is creating left and right blocks infinitely despite the fact that there already is a left or a right block. It should test the neighboorhood and check that a block already exists and don't do anything, but instead it is just creating blocks with no respect whatsoever to the if statements

Here is the script code

using UnityEngine; using System.Collections;

public class CornerBlockInstance : MonoBehaviour {

     public BoxCollider2D block;
     RaycastHit2D uhit;
     RaycastHit2D lhit;
     RaycastHit2D rhit;
 
     void Start () {
         TerrainGeneration (); 
     }
 
     void TerrainGeneration() {
 
         uhit = Physics2D.Raycast (new Vector2 (transform.position.x + 0.5f, transform.position.y + 1.1f), new Vector2 (0, 0.5f), 0.5f);
 
         lhit = Physics2D.Raycast (new Vector2 (transform.position.x - 0.1f, transform.position.y + 0.5f), new Vector2 (-0.5f, 0), 0.5f);
 
         rhit = Physics2D.Raycast (new Vector2 (transform.position.x + 1.1f, transform.position.y + 0.5f), new Vector2 (0.5f, 0), 0.5f);
 
         Debug.DrawRay (new Vector2 (transform.position.x + 0.5f, transform.position.y + 1.1f), new Vector2 (0, 0.5f), Color.blue, 200);
         Debug.DrawRay (new Vector2 (transform.position.x - 0.1f, transform.position.y + 0.5f), new Vector2 (-0.5f, 0), Color.blue, 200);
         Debug.DrawRay (new Vector2 (transform.position.x + 1.1f, transform.position.y + 0.5f), new Vector2 (0.5f, 0), Color.blue, 200);
 
         if (uhit) {
             if (lhit != null) {
 
                 BoxCollider2D heightBlock; 
                 heightBlock = Instantiate (block, new Vector2 (transform.position.x - 1f, transform.position.y), transform.rotation) as BoxCollider2D;
                 Debug.Log (lhit.transform.position);
             }
 
             if (rhit == null) {
 
                 BoxCollider2D heightBlock1; //instancia um bloco
                 heightBlock1 = Instantiate (block, new Vector2 (transform.position.x + 1f, transform.position.y), transform.rotation) as BoxCollider2D;
                 Debug.Log (rhit.transform.position);
         }
     }
 }

 

I am not sure where the problem resides in my code but I think it might have something to do with the if statements and the fact that I am checking for a null raycast hit.

Thanks in advance.