diff --git a/controller/monitor/disk_monitor.go b/controller/monitor/disk_monitor.go
index aed2946407..c6511f016d 100644
--- a/controller/monitor/disk_monitor.go
+++ b/controller/monitor/disk_monitor.go
@@ -136,7 +136,6 @@ func (m *DiskMonitor) GetCollectedData() (interface{}, error) {
 func (m *DiskMonitor) run(value interface{}) error {
 	node, err := m.ds.GetNode(m.nodeName)
 	if err != nil {
-		logrus.WithError(err).Errorf("Failed to get longhorn node %v", m.nodeName)
 		return errors.Wrapf(err, "failed to get longhorn node %v", m.nodeName)
 	}
 
diff --git a/controller/node_controller.go b/controller/node_controller.go
index 047ff17728..61e2ab91e8 100644
--- a/controller/node_controller.go
+++ b/controller/node_controller.go
@@ -375,22 +375,6 @@ func (nc *NodeController) syncNode(key string) (err error) {
 
 	if node.DeletionTimestamp != nil {
 		nc.eventRecorder.Eventf(node, corev1.EventTypeWarning, constant.EventReasonDelete, "Deleting node %v", node.Name)
-
-		if nc.diskMonitor != nil {
-			nc.diskMonitor.Stop()
-			nc.diskMonitor = nil
-		}
-
-		if nc.environmentCheckMonitor != nil {
-			nc.environmentCheckMonitor.Stop()
-			nc.environmentCheckMonitor = nil
-		}
-
-		if nc.snapshotMonitor != nil {
-			nc.snapshotMonitor.Stop()
-			nc.snapshotMonitor = nil
-		}
-
 		return nc.ds.RemoveFinalizerForNode(node)
 	}