Error message when clicking beyond "no music": show
It is a little hard to explain how I got this...
If you click the left arrow button rapidly enough to scroll past "no music," you'll end up going beyond it (because the left arrow button does NOT instantly gray out just as you select "no music," so you have barely enough time to click it again).
Error message when clicking beyond "Lava": show
Same deal, except this happens when clicking the right arrow button rapidly enough to go beyond "Lava."
In both cases, beyond each is just the same track title, and you can just click back to the available music. So, this doesn't seem to break anything.