diff --git a/public/app/features/panel/metrics_panel_ctrl.ts b/public/app/features/panel/metrics_panel_ctrl.ts
index 373f2bd910a..5bb76e9fd45 100644
--- a/public/app/features/panel/metrics_panel_ctrl.ts
+++ b/public/app/features/panel/metrics_panel_ctrl.ts
@@ -252,6 +252,7 @@ class MetricsPanelCtrl extends PanelCtrl {
       },
       complete: () => {
         console.log('panel: observer got complete');
+        this.dataStream = null;
       }
     });
   }