Index: src/libs/zbxserver/expression.c
===================================================================
--- src/libs/zbxserver/expression.c	(revision 7726)
+++ src/libs/zbxserver/expression.c	(revision 7734)
@@ -176,7 +176,7 @@
 			" where i.itemid=f.itemid and f.functionid=" ZBX_FS_UI64,
 			functionid);
 
-	if (NULL != (row = DBfetch(result)) && SUCCEED != DBis_null(row[0]))
+	if (NULL != (row = DBfetch(result)) && SUCCEED != DBis_null(row[4]))
 	{
 		ZBX_STR2UINT64(itemid, row[0]);
 		value_type = atoi(row[1]);