PHP Fatal error: Call to undefined function get_current_screen

I’m getting this entry in debug.log:
PHP Fatal error: Uncaught Error: Call to undefined function NestedPages\get_current_screen() in \wp-content\plugins\wp-nested-pages\app\Redirects.php:64

The offending line:

public function linkDeleted($post_id) {
   $screen = get_current_screen(); 
   if ( !$screen ) return;

A possible fix:

public function linkDeleted($post_id) {
   if ( function_exists( 'get_current_screen' ) )
        $screen = get_current_screen();
   else return;

Thanks.