diff --git a/src/check_meta_service b/src/check_meta_service
index c58eed61f..4fa8f59dd 100644
--- a/src/check_meta_service
+++ b/src/check_meta_service
@@ -122,6 +122,7 @@ if (!defined($OPTION{'id'})) {
 sub calculate_meta() {
 	my $result;
 	my $val;
+	my $total;
 	
 	if ($calculation eq "MIN") {
 		@metric_value_tab = sort(@metric_value_tab);
@@ -152,7 +153,11 @@ sub calculate_meta() {
 		foreach $val (@metric_value_tab) {
 			$result += $val;
 		}
-		$result = $result / scalar(@metric_value_tab);
+		$total = scalar(@metric_value_tab);
+		if (!$total) {
+			$total = 1;
+		}
+		$result = $result / $total;
 	}
 	return $result;
 } 
@@ -198,16 +203,17 @@ sub retrieve_by_list() {
 		$DBRES3 = $db_centstorage->prepare($query3);
 		if (!$DBRES3->execute) {die "Error:" . $DBRES3->errstr . "\n";}
 		$row3 = $DBRES3->fetchrow_hashref();
-		
-		$query4 = "SELECT ss.perfdata FROM `".$ndo_prefix."servicestatus` ss, `".$ndo_prefix."services` s, `".$ndo_prefix."hosts` h WHERE ss.service_object_id = s.service_object_id AND s.host_object_id = h.host_object_id AND h.display_name = '".$row3->{'host_name'}."' AND s.display_name = '".$row3->{'service_description'}."' LIMIT 1"; 
-		$DBRES4 = $db_broker->prepare($query4);
-		if (!$DBRES4->execute) {die "Error:" . $DBRES4->errstr . "\n";}
-		$row4 = $DBRES4->fetchrow_hashref();
-		$row4->{'perfdata'} =~ m/$row3->{'metric_name'}=([0-9\.]+)/;
-		if (defined($1)) {
-			$metric_value_tab[$i] = $1;
-			$i++;
-		}		
+		if (defined($row3->{'service_description'}) {
+			$query4 = "SELECT ss.perfdata FROM `".$ndo_prefix."servicestatus` ss, `".$ndo_prefix."services` s, `".$ndo_prefix."hosts` h WHERE ss.service_object_id = s.service_object_id AND s.host_object_id = h.host_object_id AND h.display_name = '".$row3->{'host_name'}."' AND s.display_name = '".$row3->{'service_description'}."' LIMIT 1"; 
+			$DBRES4 = $db_broker->prepare($query4);
+			if (!$DBRES4->execute) {die "Error:" . $DBRES4->errstr . "\n";}
+			$row4 = $DBRES4->fetchrow_hashref();
+			$row4->{'perfdata'} =~ m/$row3->{'metric_name'}=([0-9\.]+)/;
+			if (defined($1)) {
+				$metric_value_tab[$i] = $1;
+				$i++;
+			}
+		}
 	}
 }