diff --git a/metric/metric.go b/metric/metric.go
index dc5c154..51670a1 100644
--- a/metric/metric.go
+++ b/metric/metric.go
@@ -20,6 +20,9 @@ func Count(name string, value int64, tag map[string]string) {
 }
 
 func Duration(name string, costMs int64, tag map[string]string) {
+	if serv == nil {
+		return
+	}
 	serv.add(&metric{
 		Type:      TypeDuration,
 		Metric:    name,
diff --git a/metric/service.go b/metric/service.go
index 94acf45..8d24e3b 100644
--- a/metric/service.go
+++ b/metric/service.go
@@ -130,8 +130,7 @@ func (s *service) report() {
 	bp.Database = s.config.Database
 	bp.Tags = s.defaultTags()
 
-	_, err := s.client.Write(bp)
-	fmt.Println(err)
+	s.client.Write(bp)
 	s.megers = nil
 }