From c405e8919712b38c14c367fed1eb46042a2c10b5 Mon Sep 17 00:00:00 2001
From: Wilmer Paulino <wilmer.paulino@gmail.com>
Date: Tue, 13 Aug 2019 18:23:05 -0700
Subject: [PATCH] discovery: check non-nil syncer upon historical sync tick

---
 discovery/sync_manager.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/discovery/sync_manager.go b/discovery/sync_manager.go
index b9a18763..059e415d 100644
--- a/discovery/sync_manager.go
+++ b/discovery/sync_manager.go
@@ -383,9 +383,10 @@ func (m *SyncManager) syncerHandler() {
 		case <-m.cfg.HistoricalSyncTicker.Ticks():
 			s := m.forceHistoricalSync()
 
-			// If we've already performed our initial historical
-			// sync, then we have nothing left to do.
-			if m.IsGraphSynced() {
+			// If we don't have a syncer available or we've already
+			// performed our initial historical sync, then we have
+			// nothing left to do.
+			if s == nil || m.IsGraphSynced() {
 				continue
 			}