--- a/dom/media/platforms/wrappers/H264Converter.cpp
+++ b/dom/media/platforms/wrappers/H264Converter.cpp
@@ -247,16 +247,17 @@ H264Converter::CreateDecoderAndInit(Medi
 
 void
 H264Converter::OnDecoderInitDone(const TrackType aTrackType)
 {
   mInitPromiseRequest.Complete();
   RefPtr<MediaRawData> sample = mPendingSample.forget();
   if (mNeedKeyframe && !sample->mKeyframe) {
     mDecodePromise.Resolve(DecodedData(), __func__);
+    return;
   }
   mNeedKeyframe = false;
   if (!mNeedAVCC
       && !mp4_demuxer::AnnexB::ConvertSampleToAnnexB(sample, mNeedKeyframe)) {
     mDecodePromise.Reject(
       MediaResult(NS_ERROR_OUT_OF_MEMORY,
                   RESULT_DETAIL("ConvertSampleToAnnexB")),
       __func__);