diff --git a/pkg/query-service/app/parser/metrics.go b/pkg/query-service/app/parser/metrics.go
index c8ec53a322..639d1b9f0b 100644
--- a/pkg/query-service/app/parser/metrics.go
+++ b/pkg/query-service/app/parser/metrics.go
@@ -49,6 +49,9 @@ func ParseMetricQueryRangeParams(r *http.Request) (*model.QueryRangeParamsV2, *m
 	// replace the variables in metrics builder filter item with actual value
 	if postData.CompositeMetricQuery.QueryType == model.QUERY_BUILDER {
 		for _, query := range postData.CompositeMetricQuery.BuilderQueries {
+			if query.TagFilters == nil || len(query.TagFilters.Items) == 0 {
+				continue
+			}
 			for idx := range query.TagFilters.Items {
 				item := &query.TagFilters.Items[idx]
 				value := item.Value