From f8ab12876c4c1857778186972ae0c51d38caf5e5 Mon Sep 17 00:00:00 2001
From: Nguyen Sy Thanh Son <thanhson1085@gmail.com>
Date: Sat, 12 Jan 2019 04:57:34 +0000
Subject: [PATCH] fix unittest

---
 core/blockchain.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/blockchain.go b/core/blockchain.go
index 5bd0a709be..2f0dc16531 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -507,8 +507,10 @@ func (bc *BlockChain) insert(block *types.Block) {
 	bc.currentBlock.Store(block)
 
 	// save cache BlockSigners
-	engine := bc.Engine().(*posv.Posv)
-	engine.CacheData(block.Header(), block.Transactions(), bc.GetReceiptsByHash(block.Hash()))
+	if bc.chainConfig.Posv != nil {
+		engine := bc.Engine().(*posv.Posv)
+		engine.CacheData(block.Header(), block.Transactions(), bc.GetReceiptsByHash(block.Hash()))
+	}
 
 	// If the block is better than our head or is on a different chain, force update heads
 	if updateHeads {