Bug, please fix

So I'm playing ranked, get to my promo series and I get first pick so I'm making my bans and someone goes "Open edit masteries and hit spacebar twice, trust me it's hilarious.". So I'm thinking this is going to be like a hidden easter egg Riot chucked in or something but no, you get a horrible white screen that doesn't go away until you close the client and you can't click on anything. So I missed my last ban and then couldn't select a champion so I got kicked from my series and I'm pretty pissed.
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