BBpress crash after update

Hi,
I have problem with bbpress after update. I get message:

Warning: in_array() expects parameter 2 to be array, null given in /home/users/domain/public_html/domain.com/wp-content/plugins/bbpress/includes/common/functions.php on line 1446

line 1446:
if ( in_array( 'post_parent__in', $wp->private_query_vars ) )

regards

https://www.ads-software.com/plugins/bbpress/