Ticket #11917: 11917.patch

wp-includes/post.php

@@ -2392 +2392 @@
                 $check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( '" . implode( "', '", esc_sql( $hierarchical_post_types ) ) . "' ) AND ID != %d AND post_parent = %d LIMIT 1";
                 $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID, $post_parent ) );
 
-                if ( $post_name_check || in_array( $slug, $feeds ) ) {
+                if ( $post_name_check || in_array( $slug, $feeds ) || is_numeric($slug) ) {
                         $suffix = 2;
                         do {
                                 $alt_post_name = substr( $slug, 0, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";