Bug in champion selection ( Couldn't pick champion )

I was in champion select, my last ban was Zed, after i banned him i opened the masteries as u can see and i couldn't close it because of the Zed image.

I tried to press Esc, press on every place on the league screen but still couldn't pick or close the mastery page therefore i lost LP and had to wait in queue because i " dodged ".

If anyone knows what should i do next time please tell me because i get the ( champion image a lot ) and can't close it until i hover over another champion.