From d65e65cd6c56a7b346925a6abac624acbd4d332b Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Tue, 3 Sep 2024 22:43:14 +0000
Subject: [PATCH] Posts, Post Types: Check if the post type exists in
 `_admin_notice_post_locked()`.

This adds a guard to verify the result of `get_post_type_object()` before retrieving the `all_items` label, as the function returns `null` if the post type does not exist.

Follow-up to [24527].

Props pcarvalho, akshat280, mukesh27, SergeyBiryukov.
Fixes #60947.
Built from https://develop.svn.wordpress.org/trunk@58983


git-svn-id: http://core.svn.wordpress.org/trunk@58379 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/includes/post.php | 13 ++++++++-----
 wp-includes/version.php    |  2 +-
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 6da6601931..e5e1e5d147 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1804,18 +1804,21 @@ function _admin_notice_post_locked() {
 		$locked = false;
 	}
 
-	$sendback = wp_get_referer();
-	if ( $locked && $sendback && ! str_contains( $sendback, 'post.php' ) && ! str_contains( $sendback, 'post-new.php' ) ) {
+	$sendback      = wp_get_referer();
+	$sendback_text = __( 'Go back' );
 
-		$sendback_text = __( 'Go back' );
-	} else {
+	if ( ! $locked || ! $sendback || str_contains( $sendback, 'post.php' ) || str_contains( $sendback, 'post-new.php' ) ) {
 		$sendback = admin_url( 'edit.php' );
 
 		if ( 'post' !== $post->post_type ) {
 			$sendback = add_query_arg( 'post_type', $post->post_type, $sendback );
 		}
 
-		$sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
+		$post_type_object = get_post_type_object( $post->post_type );
+
+		if ( $post_type_object ) {
+			$sendback_text = $post_type_object->labels->all_items;
+		}
 	}
 
 	$hidden = $locked ? '' : ' hidden';
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 1bf0015d67..0fb1852372 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58981';
+$wp_version = '6.7-alpha-58983';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.