league crashed in loading screen plz help

hey riot on friday 19 i played a game of league but the my screen went blackand said couldnt connect to httpserver i think and i cheched and my internet was working but it just didnt do anything and i tried thrice and on the third time my entire screen completely went black said the messade so i did alt tab to try again but still my screen was black so i thought it was just a bug so i shut down my comp and then the next day which is today i went on league and saw i had a notice saying for the next 5 games i had to wait 20 min but it wasnt my fault it crashed plz help i feel like this right now and i dont want this to effect teh pool party stuff plz help