BreadthTraverse gets stuck somewhere. When I use the debug feature, Visual Studio hits an error and closes after line 173.

BinarySearchTree.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BinaryTree
{
    class Program
    {
        static void Main(string[] args)
        {
            var newBST = new BSTNode<string>();
            newBST.Add("purple");
            newBST.Add("green");
            newBST.Add("blue");
            

        }
    }

    public class BSTNode<T> where T : IComparable<T>
    {
        public T Value { get; set; }
        public BSTNode<T> Right { get; set; }
        public BSTNode<T> Left { get; set; }
        public bool Printed { get; set; }
        public int Count { get; set; } = 1;

        public void Add(T newValue)
        {
            //If this node does not hold a value, set it to the value currently being added
            if (Value == null)
            {
                Value = newValue;
            }
            //If there is a value in the node, compare the new value to the current node value. Either increment the count by 1, or create a child node (left or right) based on how the new value compares to the current node value.
            else
            {
                //This var will hold one of three options, as defined by IComparable: less than zero, zero, or greater than zero
                var compared = Value.CompareTo(newValue);
                if (compared == 0) { Count += 1; }
                if (compared == -1) { Left = new BSTNode<T>(); Left.Add(newValue); }
                if (compared == +1) { Right = new BSTNode<T>(); Right.Add(newValue); }
            }
        }








    }