From cb4d3dff2d69746946b33160d744503a00bad49b Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Wed, 7 Aug 2019 04:10:15 -1100
Subject: [PATCH] Fix initial flags

---
 src/pow.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pow.cpp b/src/pow.cpp
index d2d71e1f4..f925a7b30 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -280,7 +280,8 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
         bnPrev.SetCompact(pindexFirst->nBits);
         for (i=0; pindexFirst != 0 && i<(int32_t)(sizeof(ct)/sizeof(*ct)); i++)
         {
-            zflags[i] = (pindexFirst->nBits & 3);
+            if ( height-i-1 >= (int32_t)(sizeof(ct)/sizeof(*ct)) )
+                zflags[i] = (pindexFirst->nBits & 3);
             /*if ( (pindexFirst->nBits&3) != 0 )
             {
                 ct[i] = UintToArith256(pindexFirst->GetBlockHash());