Riot FIX THIS for me plz

Its the same bug where i crash after champ select then there is a black screen. i don't have lolreplays, i'm running on a new computer, it runs league smoothly a few weeks ago, i have wired internet connection which is fairly quick. But i don't understand why DOES IT STILL CRASH? Seriously Riot I LOVE league and i don't want to be unable to play it again on my PC, PLEASE fix this immediately