Ticket #20529: 20529.patch

wp-includes/author-template.php

@@ -89 +89 @@
 
 /**
  * Retrieve the requested data of the author of the current post.
+ *
  * @link http://codex.wordpress.org/Template_Tags/the_author_meta
  * @since 2.8.0
- * @uses $authordata The current author's DB object (if $user_id not specified).
+ * @global $authordata The current author's DB object (if $user_id not specified).
  * @param string $field selects the field of the users record.
  * @param int $user_id Optional. User ID.
  * @return string The author's field from the current author's DB object.
  */
 function get_the_author_meta( $field = '', $user_id = false ) {
-        if ( ! $user_id ) {
-                global $authordata;
-                $user_id = $authordata->ID;
+        if ( ! is_int( $user_id ) ) {
+                global $authordata, $post;
+
+                // Author data might not be available yet
+                if ( empty( $authordata ) ) {
+
+                        // Post might have been manipulated
+                        if ( empty( $post->post_author ) ) {
+                                wp_reset_postdata();
+                        }
+
+                        // Set author data according to the post author
+                        $authordata = get_userdata( $post->post_author );
+                }
+
+                // Set the user ID if we have one
+                if ( ! empty( $authordata->ID ) ) {
+                        $user_id = $authordata->ID;
+                }
         } else {
                 $authordata = get_userdata( $user_id );
         }