diff -Naur zabbix-2.0.9.orig/frontends/php/api/classes/CHostGroup.php zabbix-2.0.9/frontends/php/api/classes/CHostGroup.php
--- zabbix-2.0.9.orig/frontends/php/api/classes/CHostGroup.php	2013-10-08 22:27:49.000000000 +1100
+++ zabbix-2.0.9/frontends/php/api/classes/CHostGroup.php	2013-10-24 12:53:45.579115456 +1100
@@ -347,7 +347,7 @@
 					'SELECT NULL'.
 					' FROM items i,graphs_items gi'.
 					' WHERE hg.hostid=i.hostid'.
-						' AND i.itemid=gi.itemid'.
+						' AND i.itemid=gi.itemid '.zbx_limit(1).
 					')';
 		}