Master Page Bug "Will Fill All Your Mastery Slots"

Ok so I just got into a ranked queue where some dude says "Hey there's this bug with the mastery page that will fill all three trees; you just gotta hit the edit button and press space three times."

So I figured this wasn't legit and would probably clear all the mastery slots on the page so I made a new page and tried it. Well it doesn't clear all the slots or fill them,** it glitches the page altogether so that when you exit out of the editing page it stays there as a big white box** and you can't pick a champ or anything.

Because of this it covered the champ select area, and I wasn't able to pick a champ and** I was forced to dodge the queue since I failed to pick a champ**. And of course I also lost lp because of this and got a 5 (or 6, whatever it is) min ban.

I just figured this is something a rioter should hear about before it gets too popular and starts really screwing up peoples lp gains.

Unfortunately I didn't memorize the people names as I was frantically trying to get rid of the stupid page so I can't even report them.