From 01c26fd0ec76744392c4c8c616379ddcec5dab43 Mon Sep 17 00:00:00 2001
From: woodser <woodser@protonmail.com>
Date: Wed, 29 May 2019 17:39:11 -0400
Subject: [PATCH] call onNewBlock() iff listener registered

---
 src/wallet/MoneroWallet.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/wallet/MoneroWallet.cpp b/src/wallet/MoneroWallet.cpp
index 9e04e81..dc30781 100644
--- a/src/wallet/MoneroWallet.cpp
+++ b/src/wallet/MoneroWallet.cpp
@@ -51,10 +51,12 @@ namespace monero {
 
     virtual void on_new_block(uint64_t height, const cryptonote::block& cnBlock) {
 
-      // notify listeners of block
-      MoneroBlock block;
-      block.height = height;
-      listener->onNewBlock(block);
+      // notify listener of block
+      if (this->listener != nullptr) {
+	MoneroBlock block;
+	block.height = height;
+        listener->onNewBlock(block);
+      }
 
       // notify listeners of sync progress
       if (syncStartHeight != nullptr && height > *syncStartHeight) {