From b5d3a04ff077a29b648c514e51674e95d9e1e301 Mon Sep 17 00:00:00 2001
From: jc <jc@jc>
Date: Wed, 28 Feb 2018 21:13:55 -0500
Subject: [PATCH] lock when selecting anchor

---
 src/wallet/asyncrpcoperation_shieldcoinbase.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/wallet/asyncrpcoperation_shieldcoinbase.cpp b/src/wallet/asyncrpcoperation_shieldcoinbase.cpp
index 8c8de21e6f2..20d659cc226 100644
--- a/src/wallet/asyncrpcoperation_shieldcoinbase.cpp
+++ b/src/wallet/asyncrpcoperation_shieldcoinbase.cpp
@@ -279,7 +279,12 @@ void AsyncRPCOperation_shieldcoinbase::sign_send_raw_transaction(UniValue obj)
 
 
 UniValue AsyncRPCOperation_shieldcoinbase::perform_joinsplit(ShieldCoinbaseJSInfo & info) {
-    uint256 anchor = pcoinsTip->GetBestAnchor();
+    uint256 anchor;
+    {
+        LOCK(cs_main);
+        anchor = pcoinsTip->GetBestAnchor();
+    }
+
     if (anchor.IsNull()) {
         throw std::runtime_error("anchor is null");
     }