Mastery page is broken to high hell.

If you're in a game lobby, and select change masteries, and press spacebar 3 times, (a troll said to do this, thinking there was no harm, i did) afterwards you would get all masteries available to you. The thing that happened next was unbelievably frustrating and time wasting, what happens is after you close the mastery window after it NOT WORKING(shock, i know) the mastery window becomes a white square that never goes away, and physically forces you to dodge if you haven't picked a champion. It remains even through dodging, and made me have to exit the client entirely, wasting time. Please for the love of god fix this riot.