From 08b95e747bd96d054a2ffd4371a0f0e7328de062 Mon Sep 17 00:00:00 2001
From: Mengxin Liu <mengxin@alauda.io>
Date: Tue, 2 Mar 2021 17:00:56 +0800
Subject: [PATCH] fix: gc not exist node error

```bash
failed to list static route  , ovn-nbctl: nexthop=: argument does not end in ... followed by a value
```
---
 pkg/ovs/ovn-nbctl.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/ovs/ovn-nbctl.go b/pkg/ovs/ovn-nbctl.go
index 8a2b480551c..1a0b92250ee 100644
--- a/pkg/ovs/ovn-nbctl.go
+++ b/pkg/ovs/ovn-nbctl.go
@@ -589,6 +589,9 @@ func (c Client) DeleteStaticRoute(cidr, router string) error {
 }
 
 func (c Client) DeleteStaticRouteByNextHop(nextHop string) error {
+	if nextHop == "" {
+		return nil
+	}
 	output, err := c.ovnNbCommand("--format=csv", "--no-heading", "--data=bare", "--columns=ip_prefix", "find", "Logical_Router_Static_Route", fmt.Sprintf("nexthop=%s", nextHop))
 	if err != nil {
 		klog.Errorf("failed to list static route %s, %v", nextHop, err)