From 6edb1b3e468e4ea5eca131114ee3ff26af3bcba0 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Tue, 15 Aug 2017 11:38:59 +0100
Subject: [PATCH] block_queue: do not add empty spans

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

diff --git a/src/cryptonote_protocol/block_queue.cpp b/src/cryptonote_protocol/block_queue.cpp
index 61063763..4f760582 100644
--- a/src/cryptonote_protocol/block_queue.cpp
+++ b/src/cryptonote_protocol/block_queue.cpp
@@ -189,6 +189,8 @@ std::pair<uint64_t, uint64_t> block_queue::reserve_span(uint64_t first_block_hei
     ++i;
     ++span_length;
   }
+  if (span_length == 0)
+    return std::make_pair(0, 0);
   MDEBUG("Reserving span " << span_start_height << " - " << (span_start_height + span_length - 1) << " for " << connection_id);
   add_blocks(span_start_height, span_length, connection_id, time);
   set_span_hashes(span_start_height, connection_id, hashes);