--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -414,16 +414,18 @@ MediaFormatReader::EnsureDecoderInitiali
                 auto& decoder = self->GetDecoderData(aTrack);
                 decoder.mInitPromise.Complete();
                 decoder.mDecoderInitialized = true;
                 self->ScheduleUpdate(aTrack);
               },
               [self, aTrack] (MediaDataDecoder::DecoderFailureReason aResult) {
                 auto& decoder = self->GetDecoderData(aTrack);
                 decoder.mInitPromise.Complete();
+                decoder.mDecoder->Shutdown();
+                decoder.mDecoder = nullptr;
                 self->NotifyError(aTrack);
               }));
   return false;
 }
 
 void
 MediaFormatReader::ReadUpdatedMetadata(MediaInfo* aInfo)
 {