Ticket #20900: 20900.diff

wp-admin/includes/post.php

@@ -404 +404 @@
 function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
         global $wpdb;
 
+        if ( ! post_type_exists( $post_type ) )
+                return new WP_Error( 'bad-post-type', sprintf( __( 'The specified post type “%s” does not exist.' ), $post_type ) );
+
         $post_title = '';
         if ( !empty( $_REQUEST['post_title'] ) )
                 $post_title = esc_html( stripslashes( $_REQUEST['post_title'] ));