From c910b7c28ee5837a4bd2d4b29a4af21093cc25b2 Mon Sep 17 00:00:00 2001
From: ezioruan <qiaoqinqie2@gmail.com>
Date: Sun, 28 Jan 2018 14:45:27 +0800
Subject: [PATCH] swarm: fix swarm index out of range  (#14843) * swarm: skip
 empty nodes when in findBest

---
 swarm/network/kademlia/kaddb.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/swarm/network/kademlia/kaddb.go b/swarm/network/kademlia/kaddb.go
index b37ced5ba0..e8bbc67d20 100644
--- a/swarm/network/kademlia/kaddb.go
+++ b/swarm/network/kademlia/kaddb.go
@@ -204,6 +204,12 @@ func (self *KadDb) findBest(maxBinSize int, binSize func(int) int) (node *NodeRe
 				count++
 				node = dbrow[cursor]
 
+				// skip empty nodes
+				if node == nil {
+					log.Debug(fmt.Sprintf("kaddb record (PO%03d:%d/%d) not found", po, cursor, len(dbrow)))
+					continue ROW
+				}
+
 				// skip already connected nodes
 				if node.node != nil {
 					log.Debug(fmt.Sprintf("kaddb record %v (PO%03d:%d/%d) already connected", node.Addr, po, cursor, len(dbrow)))