champion select ,masteries , press space bar 3times

Hey guys i have recently played a ranked game , during the champion select phrase i was told to press space bar three times while editing my masteries by another user. Being a naive person i did it .

After i pressed space bar three times my masteries reseted and the pop up masteries screen went blank and froze . I wasnt able to revert the masteries screen and couldn't select a champion because the pop-up masteries screen overlapped it. I wasnt able to close the pop-up masteries screen either.