If you use the "Play all" command on a Napster album, it will add one more item to the playlist than _is_ in the album.

This will cause the playlist not to be loadable using the "status" command beyond this item and cause players to stop playing at this item in the playlist.

I also noticed that a lot of Napster menus add one additional item with "text" set to null, maybe that's the same issue. In these cases a query would return count+1 items in the item_loop the last one having the "text" field set to null.