From 5a057f3d197c0463f5e93a12ced75511e0d782e7 Mon Sep 17 00:00:00 2001
From: David Zhao <david@davidzhao.com>
Date: Thu, 11 Nov 2021 23:16:21 -0800
Subject: [PATCH] Handle nil when buffer pair doesn't exist

---
 pkg/rtc/mediatrack.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkg/rtc/mediatrack.go b/pkg/rtc/mediatrack.go
index cd0a52e96..eb9d0e91c 100644
--- a/pkg/rtc/mediatrack.go
+++ b/pkg/rtc/mediatrack.go
@@ -327,6 +327,13 @@ func (t *MediaTrack) AddReceiver(receiver *webrtc.RTPReceiver, track *webrtc.Tra
 	defer t.lock.Unlock()
 
 	buff, rtcpReader := t.params.BufferFactory.GetBufferPair(uint32(track.SSRC()))
+	if buff == nil || rtcpReader == nil {
+		logger.Errorw("could not retrieve buffer pair", nil,
+			"participant", t.params.ParticipantIdentity,
+			"participantID", t.params.ParticipantID,
+			"track", t.ID())
+		return
+	}
 	buff.OnFeedback(t.handlePublisherFeedback)
 
 	if t.Kind() == livekit.TrackType_AUDIO {