From d95bc44c6ba2a1096ca95d1565851e5827f48e4f Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Fri, 29 Jun 2018 15:49:49 +0100
Subject: [PATCH] blockchain: fix getting invalid block data on failure

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

diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 73ce98366..87f5c165d 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -2217,7 +2217,8 @@ bool Blockchain::find_blockchain_supplement(const std::list<crypto::hash>& qbloc
   CRITICAL_REGION_LOCAL(m_blockchain_lock);
 
   bool result = find_blockchain_supplement(qblock_ids, resp.m_block_ids, resp.start_height, resp.total_height);
-  resp.cumulative_difficulty = m_db->get_block_cumulative_difficulty(resp.total_height - 1);
+  if (result)
+    resp.cumulative_difficulty = m_db->get_block_cumulative_difficulty(resp.total_height - 1);
 
   return result;
 }