Log out issues

Could you update the plugin for, or direct me on changing the code so that your logout functionality first checks if already logged out? A problem occurs when a duplicate logged in site is formed in another tab of the browser and a user logs out of the first and then the 2nd tab logout throws an error reading “WordPress Failure Notice”. I want to keep everything purely on the frontend.

I had also noticed this error independent of the above, but removed the shortcode and repasted in the logout page to fix it for the time being. It seems the logout ?_wpnonce=xyz123etc suffix part of the url changes periodically causing the WordPress Failure Notice and requiring a second screen to hit logout again.

Thanks!

https://wordpress.org/plugins/theme-my-login/