Call to undefined function get_current_screen()

Found a bug:

PHP Fatal error: Uncaught Error: Call to undefined function get_current_screen() in …/wp-content/plugins/molongui-authorship/includes/hooks/post/query.php:6

Fixed it like so:

$current_screen_id = 0;
if ( function_exists( 'get_current_screen' ) )
{
  $current_screen = get_current_screen();
  $current_screen_id = $current_screen->id;
}

Then used $current_screen_id instead of $current_screen->id in the rest of the code.

Hope this helps.

Regards, Sander.