diff --git a/dom/media/gtest/TestAudioInputProcessing.cpp b/dom/media/gtest/TestAudioInputProcessing.cpp
index 8fcf6bacce32..ed5d14fcb84f 100644
--- a/dom/media/gtest/TestAudioInputProcessing.cpp
+++ b/dom/media/gtest/TestAudioInputProcessing.cpp
@@ -74,6 +74,7 @@ TEST(TestAudioInputProcessing, UnaccountedPacketizerBuffering)
                          AudioInputProcessing::BufferInfo{
                              buffer.Elements(), nrFrames, channels, rate},
                          nextTime - nrFrames);
+    aip->ProcessInput(graph, nullptr);
     aip->Pull(graph, processedTime, nextTime, segment.GetDuration(), &segment,
               true, &ended);
     EXPECT_EQ(aip->NumBufferedFrames(graph), 24U);
@@ -93,6 +94,7 @@ TEST(TestAudioInputProcessing, UnaccountedPacketizerBuffering)
                          AudioInputProcessing::BufferInfo{
                              buffer.Elements(), nrFrames, channels, rate},
                          nextTime - (2 * nrFrames));
+    aip->ProcessInput(graph, nullptr);
     aip->Pull(graph, processedTime, nextTime, segment.GetDuration(), &segment,
               true, &ended);
     EXPECT_EQ(aip->NumBufferedFrames(graph), 120U);
diff --git a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
index 7bfd745ccad2..b2fa23f37f88 100644
--- a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
+++ b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
@@ -1083,7 +1083,7 @@ void AudioInputProcessing::ProcessInput(MediaTrackGraphImpl* aGraph,
   MOZ_ASSERT(aGraph);
   MOZ_ASSERT(aGraph->OnGraphThread());
 
-  if (mEnded || !mEnabled || !mLiveFramesAppended || !mInputData || !aSegment) {
+  if (mEnded || !mEnabled || !mLiveFramesAppended || !mInputData) {
     return;
   }
 
@@ -1095,7 +1095,12 @@ void AudioInputProcessing::ProcessInput(MediaTrackGraphImpl* aGraph,
   // code. Otherwise, directly insert the mic data in the MTG, bypassing all
   // processing.
   if (PassThrough(aGraph)) {
-    mSegment.AppendSegment(aSegment, mPrincipal);
+    if (aSegment) {
+      mSegment.AppendSegment(aSegment, mPrincipal);
+    } else {
+      InsertInGraph(aGraph, inputInfo.mBuffer, inputInfo.mFrames,
+                    inputInfo.mChannels);
+    }
   } else {
     MOZ_ASSERT(aGraph->GraphRate() == inputInfo.mRate);
     PacketizeAndProcess(aGraph, inputInfo.mBuffer, inputInfo.mFrames,