Mastery page bug in champion select.

As I was in champion select, I decided to edit one of my mastery pages. After I was finished, I clicked save and attempted to click on the X button at the top right corner of the page. The masteries disappeared, but the menu still stayed open, thus preventing me from being able to select a champion. (Clicking X didn't do anything). I either had to alt f4, or let the timer run out. I just let the timer run out and when I got put back on the main menu, it stayed on my screen. I had to close my client in order to close the menu.