--- zabbix-1.8.15/src/libs/zbxserver/evalfunc.c.orig	2013-01-16 16:14:49.000007750 +0900
+++ zabbix-1.8.15/src/libs/zbxserver/evalfunc.c	2013-01-16 16:16:01.626825771 +0900
@@ -1275,6 +1275,11 @@ static int	evaluate_NODATA(char *value, 
 	{
 		if (CONFIG_SERVER_STARTUP_TIME + arg1 > now)
 			goto clean;
+		if (0 == item->lastclock)
+		{
+			zabbix_log(LOG_LEVEL_DEBUG, "lastclock is 0 and avoid to evaluate.");
+			goto clean;
+		}
 
 		zbx_strlcpy(value, "1", MAX_BUFFER_LEN);
 	}