PHP Fatal error: Uncaught Error: Undefined constant

Hi,

just got an email from my WP instance that an error was thrown:

[07-May-2026 09:41:58 UTC] PHP Fatal error:  Uncaught Error: Undefined constant "GDBBPRESSATTACHMENTS_PATH" in /wp-content/plugins/gd-bbpress-tools/forms/tabs/d4p.php:52
Stack trace:
#0 /wp-content/plugins/gd-bbpress-tools/forms/panels.php(44): include()
#1 /wp-content/plugins/gd-bbpress-tools/code/admin.php(232): include('/www/htdocs/v02...')
#2 /wp-includes/class-wp-hook.php(341): GDBTOAdmin->menu_tools('')
#3 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters('', Array)
#4 /wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#5 /wp-admin/admin.php(264): do_action('forum_page_gdbb...')
#6 /wp-admin/edit.php(10): require_once('/www/htdocs/v02...')
#7 {main}
  thrown in /wp-content/plugins/gd-bbpress-tools/forms/tabs/d4p.php on line 52

please advise!