Ticket #64104: fix-64104.patch

src/wp-includes/author-template.php

@@ -87 +87 @@
  *
  * @since 2.8.0
  *
+ * @param int $post_id Optional. Post ID. Defaults to the current post.
  * @return string|void The author's display name, empty string if unknown.
  */
-function get_the_modified_author() {
-        $last_id = get_post_meta( get_post()->ID, '_edit_last', true );
+function get_the_modified_author( $post_id = 0 ) {
+        $post_id = $post_id ? $post_id : get_post()->ID;
+
+        if ( ! $post_id ) {
+                return;
+        }
+
+        $last_id = get_post_meta( $post_id, '_edit_last', true );
 
         if ( $last_id ) {
                 $last_user = get_userdata( $last_id );