From 562336c97c5531bc63fd4f0dae5d652147cdd38d Mon Sep 17 00:00:00 2001
From: rjl493456442 <garyrong0905@gmail.com>
Date: Thu, 30 May 2019 19:42:35 +0800
Subject: [PATCH] les: short circuit in the unregister if peer is not
 registered

---
 les/freeclient.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/les/freeclient.go b/les/freeclient.go
index d859337c26..6ea950f608 100644
--- a/les/freeclient.go
+++ b/les/freeclient.go
@@ -166,7 +166,11 @@ func (f *freeClientPool) disconnect(address string) {
 	if f.closed {
 		return
 	}
+	// Short circuit if the peer hasn't been registered.
 	e := f.addressMap[address]
+	if e == nil {
+		return
+	}
 	now := f.clock.Now()
 	if !e.connected {
 		log.Debug("Client already disconnected", "address", address)