Entered ranked lobby in my promos and client goes completely black.

So I entered ranked queue while I just got into my promos and I saw my team for a split second before the client had a "Awaiting response from server..." show up, it allowed me to click cancel but I didn't until 2 minutes into it checking again and again. It caused me to dodge one of my promo games allowing me to do nothing at all other than talk to friends. Riot, please fix your client.
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