diff --git a/src/Common/MediaSource.cpp b/src/Common/MediaSource.cpp
index 659c157c..e9575374 100644
--- a/src/Common/MediaSource.cpp
+++ b/src/Common/MediaSource.cpp
@@ -238,7 +238,10 @@ toolkit::EventPoller::Ptr MediaSource::getOwnerPoller() {
 
 std::shared_ptr<MultiMediaSourceMuxer> MediaSource::getMuxer() const {
     auto listener = _listener.lock();
-    return listener ? listener->getMuxer(const_cast<MediaSource&>(*this)) : nullptr;
+    if (listener) {
+        return listener->getMuxer(const_cast<MediaSource &>(*this));
+    }
+    throw std::runtime_error("MediaSourceEvent is empty");
 }
 
 std::shared_ptr<RtpProcess> MediaSource::getRtpProcess() const {
diff --git a/src/Common/MediaSource.h b/src/Common/MediaSource.h
index fc7f77d2..591215c2 100644
--- a/src/Common/MediaSource.h
+++ b/src/Common/MediaSource.h
@@ -96,7 +96,7 @@ public:
 
     // 获取MultiMediaSourceMuxer对象  [AUTO-TRANSLATED:2de96d44]
     // Get MultiMediaSourceMuxer object
-    virtual std::shared_ptr<MultiMediaSourceMuxer> getMuxer(MediaSource &sender) const { return nullptr; }
+    virtual std::shared_ptr<MultiMediaSourceMuxer> getMuxer(MediaSource &sender) const { throw NotImplemented(toolkit::demangle(typeid(*this).name()) + "::getMuxer not implemented"); }
     // 获取RtpProcess对象  [AUTO-TRANSLATED:c6b7da43]
     // Get RtpProcess object
     virtual std::shared_ptr<RtpProcess> getRtpProcess(MediaSource &sender) const { return nullptr; }