Warning: strstr(): Empty needle in /class.wp.w3all-phpbb.php on line 649

Hi axew3.

Hi found an issue with the latest version of plugin.
Sometimes when I try to reach the WordPress site using the link in the breadcrumb (see link below) it doesn’t show me the page, but a warning:

Warning: strstr(): Empty needle in /home/rolperu/public_html/wp-content/plugins/wp-w3all-phpbb-integration/class.wp.w3all-phpbb.php on line 649

Warning: Cannot modify header information – headers already sent by (output started at /home/rolperu/public_html/wp-content/plugins/wp-w3all-phpbb-integration/class.wp.w3all-phpbb.php:649) in /home/rolperu/public_html/wp-includes/pluggable.php on line 1216

How can it be fixed?

Thanks!

Screenshot of my breadcrumb with anotations

The page I need help with: [log in to see the link]