From cc44c8f143e9ce6e10aeed2f6faf2ca589e910a4 Mon Sep 17 00:00:00 2001
From: NicolasDorier <nicolas.dorier@gmail.com>
Date: Mon, 5 Sep 2016 15:55:04 +0900
Subject: [PATCH] ContextualCheckBlockHeader should never have pindexPrev to
 NULL

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

diff --git a/src/validation.cpp b/src/validation.cpp
index fe8f8365b..a83737377 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2973,7 +2973,8 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
 
 bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev, int64_t nAdjustedTime)
 {
-    const int nHeight = pindexPrev == NULL ? 0 : pindexPrev->nHeight + 1;
+    assert(pindexPrev != NULL);
+    const int nHeight = pindexPrev->nHeight + 1;
     // Check proof of work
     if (block.nBits != GetNextWorkRequired(pindexPrev, &block, consensusParams))
         return state.DoS(100, false, REJECT_INVALID, "bad-diffbits", false, "incorrect proof of work");