Fatal error: Uncaught Error:

Hello, the latest update of this plugin is causing problems on my website.

Fatal error: Uncaught Error: Call to undefined function wp_get_current_user() in /var/customers/webs/xxxx/xxxx/wp-includes/capabilities.php:911 Stack trace: #0 /var/customers/webs/xxxx/xxxx/puraguin/disable-thumbnails-and-threshold/disable-thumbnails-and-thresold.php(65): current_user_can() #1 /var/customers/webs/xxxx/xxxx/wp-settings.php(545): include_once('…') #2 /var/customers/webs/xxxx/xxxx/wp-config.php(111): require_once('…') #3 /var/customers/webs/xxxx/xxxx/wp-load.php(50): require_once('…') #4 /var/customers/webs/xxxx/xxxx/wp-admin/admin.php(35): require_once('…') #5 /var/customers/webs/xxxx/xxxx/wp-admin/plugins.php(10): require_once('…') #6 {main} thrown in /var/customers/webs/xxxx/xxxx/wp-includes/capabilities.php on line 911