Members app and URL rewriting

Hi,

I am using the code below to rewrite URL's as per https://docs.grabaperch.com/video/v/simple-url-rewriting/

# Redirect to PHP if it exists.
    # e.g. example.com/foo will display the contents of example.com/foo.php
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME}.php -f 
    RewriteRule ^(.+)$ $1.php [L,QSA]

I have a members area on the site that uses the members app.

The logout link has stopped working since i added the above the the .htaccess file. When you click logout it takes you to /clients/logout but the logout and redirection below are not working:

<?php 
    include('../admin/runtime.php');
    perch_member_log_out(); 
    PerchUtil::redirect('/clients/');

Any ideas how I can modify the code to fix this?