From faf5efa4558d857f0ecbf897933b21723a3f720c Mon Sep 17 00:00:00 2001
From: Mike Zak <mike@daglabs.com>
Date: Mon, 8 Oct 2018 18:03:58 +0300
Subject: [PATCH] [DEV-189] Fixed blockSet.highest() case when highest==nil

---
 blockdag/blockset.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/blockdag/blockset.go b/blockdag/blockset.go
index 0d9042435..690039b3c 100644
--- a/blockdag/blockset.go
+++ b/blockdag/blockset.go
@@ -38,7 +38,7 @@ func (bs blockSet) maxHeight() int32 {
 func (bs blockSet) highest() *blockNode {
 	var highest *blockNode
 	for _, node := range bs {
-		if highest.height < node.height || daghash.Less(&node.hash, &highest.hash) {
+		if highest == nil || highest.height < node.height || daghash.Less(&node.hash, &highest.hash) {
 			highest = node
 		}
 	}