From efd27c7b2b72beea9827e18b494f99375f9030bd Mon Sep 17 00:00:00 2001
From: Nishant Das <nishdas93@gmail.com>
Date: Sat, 8 Feb 2020 06:49:18 +0800
Subject: [PATCH] Fix Dynamic Topic Subscriptions (#4767)

* check for sync status

* check for chainstart

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
---
 beacon-chain/sync/subscriber.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/beacon-chain/sync/subscriber.go b/beacon-chain/sync/subscriber.go
index 9b10790e7f..14fdeb9cd5 100644
--- a/beacon-chain/sync/subscriber.go
+++ b/beacon-chain/sync/subscriber.go
@@ -211,6 +211,9 @@ func (r *Service) subscribeDynamic(topicFormat string, determineSubsLen func() i
 				stateSub.Unsubscribe()
 				return
 			case <-stateChannel:
+				if r.chainStarted && r.initialSync.Syncing() {
+					continue
+				}
 				// Update topic count.
 				wantedSubs := determineSubsLen()
 				// Resize as appropriate.