commit d8e3fa08c05d3dda244a78dffa36b178278d6961
author michaelt <michaelt@webrtc.org> Tue Oct 18 16:40:34 2016
committer Commit bot <commit-bot@chromium.org> Tue Oct 18 16:40:38 2016
tree b4c340e79b990c6775f8056bf29c5f2cd17a81fb
parent 0556d953bbc75edac71cf0dd9d214ec25fa61878

Call OnTransportFeedback just when feedback_observer exist.

BUG=webrtc:6523

Review-Url: https://codereview.webrtc.org/2404233004
Cr-Original-Commit-Position: refs/heads/master@{#14667}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9960bb14695f5c9a1c60c0f371a21d58b663e8ff

voice_engine/channel.cc

diff --git a/voice_engine/channel.cc b/voice_engine/channel.cc
index ac42430..e36e54d 100644
--- a/voice_engine/channel.cc
+++ b/voice_engine/channel.cc
@@ -183,7 +183,8 @@
   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();