--- a/dom/media/platforms/apple/AppleATDecoder.cpp
+++ b/dom/media/platforms/apple/AppleATDecoder.cpp
@@ -278,16 +278,19 @@ AppleATDecoder::DecodeSample(MediaRawDat
 
   AudioSampleBuffer data(outputData.Elements(), outputData.Length());
   if (!data.Data()) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   if (mChannelLayout && !mAudioConverter) {
     AudioConfig in(*mChannelLayout.get(), rate);
     AudioConfig out(channels, rate);
+    if (!in.IsValid() || !out.IsValid()) {
+      return NS_ERROR_FAILURE;
+    }
     mAudioConverter = MakeUnique<AudioConverter>(in, out);
   }
   if (mAudioConverter) {
     MOZ_ASSERT(mAudioConverter->CanWorkInPlace());
     data = mAudioConverter->Process(Move(data));
   }
 
   RefPtr<AudioData> audio = new AudioData(aSample->mOffset,