diff --git a/pkg/services/alerting/notifiers/alertmanager.go b/pkg/services/alerting/notifiers/alertmanager.go
index 08f8e8be29c..607a97d977c 100644
--- a/pkg/services/alerting/notifiers/alertmanager.go
+++ b/pkg/services/alerting/notifiers/alertmanager.go
@@ -78,6 +78,10 @@ func (this *AlertmanagerNotifier) Notify(evalContext *alerting.EvalContext) erro
 		alerts = append(alerts, alertJSON)
 	}
 
+	if len(alerts) == 0 {
+		return nil
+	}
+
 	bodyJSON := simplejson.NewFromAny(alerts)
 	body, _ := bodyJSON.MarshalJSON()