Log Out

I am using this plugin, and it works perfects, but I have a issue when a user sign out because wordpress says no user present, I meang wordpress delete all session but the user tries to sign in the sts federation says the user is login so the 2 user can not log in because the old session is actived, Any idea?

http://ww.wp.xz.cn/extend/plugins/simplesamlphp-authentication/