League client crashed after being kicked from a game lobby

This could be due to corrupt game files.

Repair the game by clicking the question mark icon to the top right of the patcher. Select "Repair" and let the patcher scan and repair corrupt game files. When the process is completed, you'll see the orange "Launch" button.

http://eune.leagueoflegends.com/sites/default/files/styles/scale_xlarge/public/upload/template_lcu_changelog_1280x720.jpg?itok=uV6zjzTq