--- lxsession-0.5.2/lxsession/settings.vala.key2	2014-10-18 01:54:57.000000000 +0900
+++ lxsession-0.5.2/lxsession/settings.vala	2015-07-13 14:56:00.830117779 +0900
@@ -56,7 +56,7 @@ namespace Lxsession
             return return_map;
         }
 
-        public void create_config_item (string categorie, string key1, string key2, string type, string? variable)
+        public void create_config_item (string categorie, string key1, string? key2, string type, string? variable)
         {
             /* only support string for now */
             string item_key = categorie + ";" + key1 + ";" + key2 + ";";
@@ -71,7 +71,7 @@ namespace Lxsession
             update_support_keys (categorie, key1, key2);
         }
 
-        public void delete_config_item (string categorie, string key1, string key2, string type)
+        public void delete_config_item (string categorie, string key1, string? key2, string type)
         {
             /* only support string for now */
             string item_key = categorie + ";" + key1 + ";" + key2 + ";";
