MAC BUG WITH YOUTUBE LINK

My game always crashes. I tried making it Fullscreen, Windowed and Borderless in game.cfg but it still crashes! I have a video link on the bottom of the post. Please help me! I really want to play LOL.

https://www.youtube.com/watch?v=wi7EdDNCzeM&feature=youtu.be

P.S. Don't add me as a friend I will reject u P.S.S Don't hack my account I have it linked already