Null Reference Exception after disposing and re-initializing object

```
if (!String.IsNullOrEmpty(_nextSongToPlay))
{
if (activeMusic!=null && activeMusic.State== SoundStreamState.Playing)
{
activeMusic.Stop();
activeMusic.Dispose();
}
activeMusic = new SoundStream(System.IO.File.OpenRead(_nextSongToPlay), musicEngine);
System.Threading.Thread.Sleep(100);
activeMusic.Volume = currentVolume;
activeMusic.Play();
_nextSongToPlay = null;
}
```

It seems that there is some kind of race condition that is triggered by calling the activeMusic.Stop(); method... without putting a System.Threading.Thread.Sleep setting the volume on the activeMusic soundstream causes a null exception to be thrown.

This exception occurs if the activeMusic soundstream is or is not disposed, but only if it was not null before creating the New soundStream