--- a/dom/media/platforms/wrappers/H264Converter.cpp
+++ b/dom/media/platforms/wrappers/H264Converter.cpp
@@ -126,16 +126,20 @@ H264Converter::Decode(MediaRawData* aSam
   aSample->mExtraData = mCurrentConfig.mExtraData;
 
   return mDecoder->Decode(aSample);
 }
 
 RefPtr<MediaDataDecoder::FlushPromise>
 H264Converter::Flush()
 {
+  mDecodePromiseRequest.DisconnectIfExists();
+  mFlushRequest.DisconnectIfExists();
+  mShutdownRequest.DisconnectIfExists();
+  mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
   mNeedKeyframe = true;
   if (mDecoder) {
     return mDecoder->Flush();
   }
   return FlushPromise::CreateAndResolve(true, __func__);
 }
 
 RefPtr<MediaDataDecoder::DecodePromise>