diff --git a/content/renderer/media/stream/webmediaplayer_ms.cc b/content/renderer/media/stream/webmediaplayer_ms.cc
index 7ce45f5b81ee..d8483027e0a4 100644
--- a/content/renderer/media/stream/webmediaplayer_ms.cc
+++ b/content/renderer/media/stream/webmediaplayer_ms.cc
@@ -424,6 +424,7 @@ void WebMediaPlayerMS::TrackRemoved(const blink::WebMediaStreamTrack& track) {
 }
 
 void WebMediaPlayerMS::ActiveStateChanged(bool is_active) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   // The case when the stream becomes active is handled by TrackAdded().
   if (is_active)
     return;
diff --git a/content/renderer/media/webrtc/webrtc_audio_renderer.cc b/content/renderer/media/webrtc/webrtc_audio_renderer.cc
index 4143171f4d7b..b18f49d21f83 100644
--- a/content/renderer/media/webrtc/webrtc_audio_renderer.cc
+++ b/content/renderer/media/webrtc/webrtc_audio_renderer.cc
@@ -374,10 +374,14 @@ void WebRtcAudioRenderer::SwitchOutputDevice(
     const media::OutputDeviceStatusCB& callback) {
   DVLOG(1) << "WebRtcAudioRenderer::SwitchOutputDevice()";
   DCHECK(thread_checker_.CalledOnValidThread());
+  if (!source_) {
+    callback.Run(media::OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
+    return;
+  }
+
   DCHECK_GE(session_id_, 0);
   {
     base::AutoLock auto_lock(lock_);
-    DCHECK(source_);
     DCHECK_NE(state_, UNINITIALIZED);
   }
 
diff --git a/content/renderer/media/webrtc/webrtc_audio_renderer_unittest.cc b/content/renderer/media/webrtc/webrtc_audio_renderer_unittest.cc
index 054d86257744..7e886d27945c 100644
--- a/content/renderer/media/webrtc/webrtc_audio_renderer_unittest.cc
+++ b/content/renderer/media/webrtc/webrtc_audio_renderer_unittest.cc
@@ -297,4 +297,22 @@ TEST_F(WebRtcAudioRendererTest, InitializeWithInvalidDevice) {
             mock_sink_->GetOutputDeviceInfo().device_id());
 }
 
+TEST_F(WebRtcAudioRendererTest, SwitchOutputDeviceStoppedSource) {
+  SetupRenderer(kDefaultOutputDeviceId);
+  auto original_sink = mock_sink_;
+  renderer_proxy_->Start();
+
+  EXPECT_CALL(*original_sink.get(), Stop());
+  EXPECT_CALL(*source_.get(), RemoveAudioRenderer(renderer_.get()));
+  EXPECT_CALL(*this, MockSwitchDeviceCallback(
+                         media::OUTPUT_DEVICE_STATUS_ERROR_INTERNAL));
+  base::RunLoop loop;
+  renderer_proxy_->Stop();
+  renderer_proxy_->SwitchOutputDevice(
+      kInvalidOutputDeviceId,
+      base::BindRepeating(&WebRtcAudioRendererTest::SwitchDeviceCallback,
+                          base::Unretained(this), &loop));
+  loop.Run();
+}
+
 }  // namespace content