Masteries Prevent Champion Selection Bug [CLIENT]

When in champion selection you are able to trick people into dodging by making them press 3 times in the masteries editor. This will prevent you from exiting the masteries editor and it will cover up all the champions and you will be unable to select one. I have attached a video of the bug. Here is how you replicate the bug:

1. Enter a game
2. When in champion selection open the "masteries editor" (found left of the summoner spells)
3. Press space bar 3 times
4. Attempt to exit the masteries editor
5. Done It seems this is not well known so I thought I should report it.