diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index 38287dc7c3..f05c504cc1 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -241,6 +241,13 @@ function map_meta_cap( $cap, $user_id, ...$args ) {
 			}
 
 			$status_obj = get_post_status_object( $post->post_status );
+			if ( ! $status_obj ) {
+				/* translators: 1: Post status, 2: Capability name. */
+				_doing_it_wrong( __FUNCTION__, sprintf( __( 'The post status %1$s is not registered, so it may not be reliable to check the capability "%2$s" against a post with that status.' ), $post->post_status, $cap ), '5.4.0' );
+				$caps[] = 'edit_others_posts';
+				break;
+			}
+
 			if ( $status_obj->public ) {
 				$caps[] = $post_type->cap->read;
 				break;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index dcdf41c1ae..54832bdbce 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-47177';
+$wp_version = '5.4-alpha-47178';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.