From df473cc2775205c011cfe7f8bd5d58dc4f44afc0 Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Sun, 7 Jan 2018 18:06:14 +0700
Subject: [PATCH] Check for null index in FindFork

---
 src/chain.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/chain.cpp b/src/chain.cpp
index 5b8ce076c..9cd13d997 100644
--- a/src/chain.cpp
+++ b/src/chain.cpp
@@ -51,6 +51,8 @@ CBlockLocator CChain::GetLocator(const CBlockIndex *pindex) const {
 }
 
 const CBlockIndex *CChain::FindFork(const CBlockIndex *pindex) const {
+    if ( pindex == 0 )
+        return(0);
     if (pindex->nHeight > Height())
         pindex = pindex->GetAncestor(Height());
     while (pindex && !Contains(pindex))