From 9960bb14695f5c9a1c60c0f371a21d58b663e8ff Mon Sep 17 00:00:00 2001
From: michaelt <michaelt@webrtc.org>
Date: Tue, 18 Oct 2016 09:40:34 -0700
Subject: [PATCH] Call OnTransportFeedback just when feedback_observer exist.

BUG=webrtc:6523

Review-Url: https://codereview.webrtc.org/2404233004
Cr-Commit-Position: refs/heads/master@{#14667}
---
 webrtc/voice_engine/channel.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index ac424305b7..e36e54d075 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -183,7 +183,8 @@ class TransportFeedbackProxy : public TransportFeedbackObserver {
   void OnTransportFeedback(const rtcp::TransportFeedback& feedback) override {
     RTC_DCHECK(network_thread_.CalledOnValidThread());
     rtc::CritScope lock(&crit_);
-    feedback_observer_->OnTransportFeedback(feedback);
+    if (feedback_observer_)
+      feedback_observer_->OnTransportFeedback(feedback);
   }
   std::vector<PacketInfo> GetTransportFeedbackVector() const override {
     RTC_NOTREACHED();