Ticket #3708: 3708.diff

wp-content/plugins/handbook/handbook.php

@@ -330 +330 @@
         }
 
         function pre_get_posts( $query ) {
-                $query->is_handbook_root = false;
+                if ( $query->is_main_query() && ! property_exists( $query, 'is_handbook_root' ) ) {
+                        $query->is_handbook_root = false;
+                }
 
                 if ( $query->is_main_query() && ! $query->is_admin && ! $query->is_search && $query->is_post_type_archive( $this->post_type ) ) {
                         // If the post type has a page to act as an archive index page, get that.