I have tried to reproduce this. This crash only occurs after playing for a little while AND upon exiting a server. I have not crashed while connected to a server. The game will not go to the Character/Server select screen, it just dumps to the desktop.
The game will start up fine again, without any issues.
I have tried launching the game, joining a server and exiting the server right away to reproduce the result, but the game will exit to the lobby just fine, without error. This crash only occurs after playing for a while and deciding to manually exit the server normally.
It's just your standard Windows Popup error "This application has unexpectedly closed", name of application, click ok, etc.