Ticket #39881: 39881.patch

wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -1289 +1289 @@
                 // Can we read the parent if we're inheriting?
                 if ( 'inherit' === $post->post_status && $post->post_parent > 0 ) {
                         $parent = get_post( $post->post_parent );
-                        return $this->check_read_permission( $parent );
+                        if ( $parent ) {
+                                return $this->check_read_permission( $parent );
+                        }
                 }
 
                 /*