Tukukkk

if (Input.GetAxis("Horizontal") > 0)

        board[bodies[bodies.Count - 1].x, bodies[bodies.Count - 1].y].direction = Direction.RIGHT;

    else if (Input.GetAxis("Horizontal") < 0)

        board[bodies[bodies.Count - 1].x, bodies[bodies.Count - 1].y].direction = Direction.LEFT;

    else if (Input.GetAxis("Vertical") > 0)

    {

        board[bodies[bodies.Count - 1].x, bodies[bodies.Count - 1].y].direction = Direction.UP;

    }

    else if (Input.GetAxis("Vertical") < 0)

    {

        board[bodies[bodies.Count - 1].x, bodies[bodies.Count - 1].y].direction = Direction.DOWN;

    }

    else{

        board[bodies[bodies.Count-1].x, bodies[bodies.Count - 1].y].direction = board[bodies[bodies.Count - 2].x, bodies[bodies.Count - 2].x].direction;

    }

<-code generating error.
Init(start statement)::

        bodySize = bodyOriginal.transform.localScale.x;

    TopRight = Camera.main.ScreenToWorldPoint(new Vector2(Screen.width, Screen.height));

    BottomLeft = Camera.main.ScreenToWorldPoint(new Vector2(0, 0));

    TopRight += new Vector2(bodySize, bodySize);

    BottomLeft += new Vector2(bodySize, bodySize);

    BOARD_HEIGHT = (int)(TopRight.y / bodySize);

    BOARD_WIDTH = (int)(TopRight.x / bodySize);

    board = new GameManager.BoardState[BOARD_WIDTH, BOARD_HEIGHT];

    board[1, 1].isSnake = Objects.SNAKE;

    board[1, 2].isSnake = Objects.SNAKE;

    board[1, 1].direction = Direction.RIGHT;

    board[1, 2].direction = Direction.RIGHT;

    Body head = Instantiate(bodyOriginal) as Body;

    Body tail = Instantiate(bodyOriginal) as Body;

    tail.GetComponent<SpriteRenderer>().sprite = tailSprite;

    head.GetComponent<SpriteRenderer>().sprite = headSprite;

    head.x = 1;

    head.y = 0;

    tail.x = 0;

    head.y = 0;

    tail.transform.localPosition = new Vector2(BottomLeft.x + (tail.x * bodySize), BottomLeft.y + (tail.y * bodySize));

    head.transform.localPosition = new Vector2(BottomLeft.x + (head.x * bodySize), BottomLeft.y + (head.y * bodySize));

    bodies.Add(head);

    bodies.Add(tail);

    food.SpawnRandom();

I think the problem is with the Init. Given that in the else statement bodies.Count - 1 is -1.
Apparently, this post has to have a certain text to code ratio in which I do not currently have met in this current sequential moment of time, I hope that this policy will be changed soon.

I divided the world point value of the camera by the local scale of the body object giving my array ridiculously low values like 2 and 3, which lead me to go out of index in my start statement which made it skip right to update with an uninitialized array.

Note: Make sure to divide worldpoint by worldpoint in unity