Working Fine Then Get: No Cameras Rendering after destroying GameObjects

I'm very new Unity and can't seem to find a solution to my problem. Everything works as intended then after a few clicks (between 0 and 10) I get "Display One, No Cameras Rendering"

I am using the simple 1 x 1 3D cubes repeated and have loaded in the FPSController as a character to interact with the world.

I have the start of a very basic 3d voxel world.

Here is my code:

 public var width = 128;
 public var depth = 128;
 public var heightScale = 20;
 public var detailScale = 25.0f;

 public var grassBlock : GameObject;
 public var stoneBlock : GameObject;
 public var snowBlock : GameObject;

  function Start () {
      var seed = Network.time * 10;
       for(var z = 0; z < width; z++){
           for(var x = 0; x < depth; x++){
               var y = Mathf.PerlinNoise((x+seed)/detailScale, (z+seed)/detailScale) * heightScale;
               var blockPos = new Vector3(x,y,z);
            if(y > 15){
             Instantiate(snowBlock, blockPos, Quaternion.identity);
             } else if(y > 5){
             Instantiate(grassBlock, blockPos, Quaternion.identity);
             } else {
             Instantiate(stoneBlock, blockPos, Quaternion.identity);
             }
         }
     }
 }

 function Update () {
     // On mouse click 
     if(Input.GetMouseButtonDown(0)){
      var cam : Transform = Camera.main.transform;
      var ray = new Ray(cam.position, cam.forward);
      var hit : RaycastHit;
      if(Physics.Raycast (ray, hit, 500))
          Destroy(hit.collider.gameObject);
      }
 }