From 7d57ac52311a13dccc6c8316e2e561a05609c2b5 Mon Sep 17 00:00:00 2001
From: Ulric Qin <ulric.qin@gmail.com>
Date: Tue, 14 Jun 2022 07:30:27 +0800
Subject: [PATCH] fix switch_legacy ni pointer

---
 inputs/switch_legacy/switch_legacy.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/inputs/switch_legacy/switch_legacy.go b/inputs/switch_legacy/switch_legacy.go
index 482d0a86..2a80510c 100644
--- a/inputs/switch_legacy/switch_legacy.go
+++ b/inputs/switch_legacy/switch_legacy.go
@@ -324,6 +324,10 @@ func (ins *Instance) gatherFlowMetrics(ips []string, slist *list.SafeList) {
 	wg.Wait()
 
 	for ip := range result {
+		if result[ip] == nil {
+			continue
+		}
+
 		if result[ip].IP == "" {
 			continue
 		}