[CRASH] Game crashes after championselect, Can't reconnect

Everytime I start a game, after the Championselect when the game closes to open the game window, this window closes after 2 seconds and there is a bugsplat error message. I restarted the launcher, my laptop and my router. I also tried to open the launcher as an admin. This happens everytime i want to reconnect to the game. PLease help me ;)