--- a/dom/media/platforms/agnostic/gmp/MediaDataDecoderProxy.cpp
+++ b/dom/media/platforms/agnostic/gmp/MediaDataDecoderProxy.cpp
@@ -19,18 +19,16 @@ void
 MediaDataDecoderCallbackProxy::FlushComplete()
 {
   mProxyDecoder->FlushComplete();
 }
 
 RefPtr<MediaDataDecoder::InitPromise>
 MediaDataDecoderProxy::InternalInit()
 {
-  MOZ_ASSERT(!mIsShutdown);
-
   return mProxyDecoder->Init();
 }
 
 RefPtr<MediaDataDecoder::InitPromise>
 MediaDataDecoderProxy::Init()
 {
   MOZ_ASSERT(!mIsShutdown);