Champion Select Mastery Page Editing

In champion select, I had opened up the mastery pages and was making a new one when I noticed that the splash art that appears when hovering a champion had remained even though I had already clicked on them. Since it was blocking the X, this prevented me from closing the mastery page and selecting a champion, which forced me to dodge the game. I'm pretty thankful that this happened in a normal match rather than ranked, but this is a pretty severe issue when it occurs, since there's no way to close the mastery page selection without clicking the X.