diff --git a/server/pyinvoker.cpp b/server/pyinvoker.cpp
index 37d2ed1c..451bd3c8 100644
--- a/server/pyinvoker.cpp
+++ b/server/pyinvoker.cpp
@@ -515,7 +515,7 @@ PythonInvoker::PythonInvoker() {
     NoticeCenter::Instance().addListener(this, Broadcast::kBroadcastCreateMuxer, [this](BroadcastCreateMuxerArgs) {
         py::gil_scoped_acquire guard;
         if (_on_create_muxer) {
-            auto py_muxer = _on_create_muxer(sender);
+            auto py_muxer = _on_create_muxer(to_python_ref(sender));
             if (py_muxer && !py_muxer.is_none()) {
                 delegate = std::make_shared<MuxerDelegatePython>(std::move(py_muxer));
             }
diff --git a/src/Common/MultiMediaSourceMuxer.h b/src/Common/MultiMediaSourceMuxer.h
index c65b9329..d2cf23b0 100644
--- a/src/Common/MultiMediaSourceMuxer.h
+++ b/src/Common/MultiMediaSourceMuxer.h
@@ -25,7 +25,7 @@
 
 namespace mediakit {
 
-class MultiMediaSourceMuxer : public MediaSourceEventInterceptor, public MediaSink, public std::enable_shared_from_this<MultiMediaSourceMuxer>{
+class MultiMediaSourceMuxer : public MediaSourceEventInterceptor, public MediaSink, public toolkit::noncopyable, public std::enable_shared_from_this<MultiMediaSourceMuxer>{
 public:
     using Ptr = std::shared_ptr<MultiMediaSourceMuxer>;
     using RingType = toolkit::RingBuffer<Frame::Ptr>;