Ticket #30184: 30184.diff

src/wp-includes/query.php

@@ -4071 +4071 @@
          * @return bool
          */
         public function is_author( $author = '' ) {
-                if ( !$this->is_author )
+                if ( ! $this->is_author ) {
                         return false;
+                }
 
-                if ( empty($author) )
+                if ( empty( $author ) ) {
                         return true;
+                }
 
                 $author_obj = $this->get_queried_object();
 
+                if ( ! is_a( $author_obj, 'WP_User' ) ) {
+                        return false;
+                }
+
                 $author = (array) $author;
 
-                if ( in_array( $author_obj->ID, $author ) )
+                if ( in_array( $author_obj->ID, $author ) ) {
                         return true;
-                elseif ( in_array( $author_obj->nickname, $author ) )
+                } elseif ( in_array( $author_obj->nickname, $author ) ) {
                         return true;
-                elseif ( in_array( $author_obj->user_nicename, $author ) )
+                } elseif ( in_array( $author_obj->user_nicename, $author ) ) {
                         return true;
+                }
 
                 return false;
         }