#2304 Wiki functionality: fix

install/sql/system.sql

@@ -4859,7 +4859,7 @@ CREATE TABLE IF NOT EXISTS `sys_objects_payments` (
 --
 
 CREATE TABLE IF NOT EXISTS `sys_objects_wiki` (
-  `id` int(11) NOT NULL,
+  `id` int(11) NOT NULL AUTO_INCREMENT,
   `object` varchar(64) NOT NULL,
   `uri` varchar(32) NOT NULL,
   `title` varchar(255) NOT NULL,