Ticket #28412: 28412.patch

wp-includes/query.php

@@ -3707 +3707 @@
                         $page_for_posts = get_option('page_for_posts');
                         $this->queried_object = get_post( $page_for_posts );
                         $this->queried_object_id = (int) $this->queried_object->ID;
-                } elseif ( $this->is_singular && !is_null($this->post) ) {
+                } elseif ( $this->is_singular && isset( $this->post ) && !is_null( $this->post ) ) {
                         $this->queried_object = $this->post;
                         $this->queried_object_id = (int) $this->post->ID;
                 } elseif ( $this->is_author ) {