Unable to finish C# Basics Final Code Challenge

This is the Code Challenge: https://teamtreehouse.com/library/c-basics/perfect/final My code is as follows:

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            while(true)
            {
                int timesRan = 0;
                Console.Write("Enter the number of times to print \"Yay!\": ");
                string entry = Console.ReadLine();
                try
                {
                    int times = int.Parse(entry);
                    while(timesRan < times)
                    {
                        Console.WriteLine("\"Yay!\"");
                        timesRan += 1;
                    }
                    break;
                }
                catch (FormatException)
                {
                    Console.WriteLine("You must enter a whole number.");
                    continue;
                }
            }
        }
    }
}

It successfully got me through step 1 and while it should pass step 2 as well, it does not. I know it should because it worked when I tried it in a Treehouse Workspace. The result in the Workspace was a FormatException, as expected, but the Code Challenge itself returned an ArgumentNullException seen below.

Bummer! System.ArgumentNullException: Value cannot be null. Parameter name: String at System.Number.StringToNumber (System.String str, System.Globalization.NumberStyles options, System.Number+NumberBuffer& number, System.Globalization.NumberFormatInfo info, System.Boolean parseDecimal) [0x00054] in /builddir/build/BUILD/mono-4.8.1/mcs/class/referencesource/mscorlib/system/number.cs:1074 at System.Number.ParseInt32 (System.String s, System.Globalization.NumberStyles style, System.Globalization.NumberFormatInfo info) [0x00014] in /builddir/build/BUILD/mono-4.8.1/mcs/class/referencesource/mscorlib/system/number.cs:745 at System.Int32.Parse (System.String s) [0x00000] in /builddir/build/BUILD/mono-4.8.1/mcs/class/referencesource/mscorlib/system/int32.cs:120 at Treehouse.CodeChallenges.Program.Main () [0x00012] in <f437b8f53cd1432eb8d9002d5e45d560>:0 at MonoTester.Run () [0x00208] in /workdir/MonoTester.cs:140

Any help that can be offered is appreciated.