From e763310b54810fd4ad9d84d32a3927a999edde3d Mon Sep 17 00:00:00 2001
From: Alexander Block <ablock84@gmail.com>
Date: Mon, 11 Mar 2019 15:18:15 +0100
Subject: [PATCH] Add missing LOCK(cs_main)

---
 src/llmq/quorums_instantsend.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/llmq/quorums_instantsend.cpp b/src/llmq/quorums_instantsend.cpp
index b79a14fbe8..b5e6593f8d 100644
--- a/src/llmq/quorums_instantsend.cpp
+++ b/src/llmq/quorums_instantsend.cpp
@@ -732,6 +732,7 @@ void CInstantSendManager::NotifyChainLock(const CBlockIndex* pindex)
     while (pindex && pindex->GetBlockHash() != lastChainLockBlock) {
         CBlock block;
         {
+            LOCK(cs_main);
             if (!ReadBlockFromDisk(block, pindex, Params().GetConsensus())) {
                 pindex = pindex->pprev;
                 continue;