From b447c5a0c650b81d20c1c4169a99fee1859053ea Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Thu, 15 Feb 2018 22:21:50 +0100
Subject: [PATCH] Merge #12349: shutdown: fix crash on shutdown with
 reindex-chainstate

ceaefdd fix possible shutdown assertion with -reindex-shutdown (Cory Fields)

Pull request description:

  Fixes the assertion error reported here: https://github.com/bitcoin/bitcoin/pull/12349#issuecomment-365095741

Tree-SHA512: db8e2a275f92a99df7f17852d00eba6df996e412aa3ed3853a9ea0a8cb9800760677532efd52f92abbf2cdcc4210957a87a5f919ac998d46c205365a7a7dffca
---
 src/validation.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/validation.cpp b/src/validation.cpp
index 59cd58678a623..0c9e119098d21 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2349,7 +2349,7 @@ bool static FlushStateToDisk(const CChainParams& chainparams, CValidationState &
             nLastWrite = nNow;
         }
         // Flush best chain related state. This can only be done if the blocks / block index write was also done.
-        if (fDoFullFlush) {
+        if (fDoFullFlush && !pcoinsTip->GetBestBlock().IsNull()) {
             // Typical Coin structures on disk are around 48 bytes in size.
             // Pushing a new one to the database can cause it to be written
             // twice (once in the log, and once in the tables). This is already