Ticket #18583: 18583.patch

wp-includes/query.php

@@ -1552 +1552 @@
                         if ( '' != $qv['author_name'] )
                                 $this->is_author = true;
 
-                        if ( !empty( $qv['post_type'] ) && ! is_array( $qv['post_type'] ) ) {
+                        if ( ! empty( $qv['post_type'] ) && ! is_array( $qv['post_type'] ) && ! $this->is_search ) {
                                 $post_type_obj = get_post_type_object( $qv['post_type'] );
                                 if ( ! empty( $post_type_obj->has_archive ) )
                                         $this->is_post_type_archive = true;