Logging out problem

Can’t exactly remember what I’ve done but I can’t log out.

This is the link that appears when I click ‘Logout’;
/wp-login.php?action=logout&redirect_to=http%3A%2F%2Fwww.mywebsite.net%2F&_wpnonce=f887bf3126

It’s just a plain white screen. And I’m still logged in.