I can't LAUNCH my game (MAC USERS)

So basically I had my mac on sleepmode with my league online and the next day I woke up and found the game had been disconnected. So I reopen the game and click launch but the game doesn't responds. When I check in further details , when I click launch there was this file called "LOCK FILE" appears and when I tried to delete it while my client is on the launch page it can't be deleted. I only managed to delete it after my client was closed but It appears back when I click launch. HELP PLEASE >< MAC USERS*[slayer-jinx-unamused]*