From ea9d92d453458218b049262da91b466c9afb259f Mon Sep 17 00:00:00 2001
From: Gregory Sanders <gsanders87@gmail.com>
Date: Wed, 26 Sep 2018 10:15:31 -0400
Subject: [PATCH] only try to set best chain if signal is registered

---
 src/validation.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/validation.cpp b/src/validation.cpp
index d7537f1fe4..9f60618b97 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3036,7 +3036,9 @@ bool static FlushStateToDisk(CValidationState &state, FlushStateMode mode, int n
     }
     if (fDoFullFlush || ((mode == FLUSH_STATE_ALWAYS || mode == FLUSH_STATE_PERIODIC) && nNow > nLastSetChain + (int64_t)DATABASE_WRITE_INTERVAL * 1000000)) {
         // Update best block in wallet (so we can detect restored wallets).
-        GetMainSignals().SetBestChain(chainActive.GetLocator());
+        if (!GetMainSignals().SetBestChain.empty()) {
+            GetMainSignals().SetBestChain(chainActive.GetLocator());
+        }
         nLastSetChain = nNow;
     }
     } catch (const std::runtime_error& e) {