From 2312cddaffa33beee2defbe89e8dee654b2cf602 Mon Sep 17 00:00:00 2001
From: Yusef Napora <yusef@protocol.ai>
Date: Mon, 11 May 2020 11:13:06 -0400
Subject: [PATCH] add nil check for decayer

---
 tag_tracer.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tag_tracer.go b/tag_tracer.go
index ce0e326..7cc0cb5 100644
--- a/tag_tracer.go
+++ b/tag_tracer.go
@@ -120,6 +120,9 @@ func (t *tagTracer) removeDeliveryTag(topic string) {
 }
 
 func (t *tagTracer) decayingDeliveryTag(topic string) (connmgr.DecayingTag, error) {
+	if t.decayer == nil {
+		return nil, fmt.Errorf("connection manager does not support decaying tags")
+	}
 	name := fmt.Sprintf("pubsub-deliveries:%s", topic)
 
 	// decrement tag value by GossipSubConnTagDecayAmount at each decay interval