diff --git a/server/VideoStack.cpp b/server/VideoStack.cpp
index 76b5ad49..bfa9bb1f 100644
--- a/server/VideoStack.cpp
+++ b/server/VideoStack.cpp
@@ -23,7 +23,11 @@
 
 INSTANCE_IMP(VideoStackManager)
 
-Param::~Param() { VideoStackManager::Instance().unrefChannel(id, width, height, pixfmt); }
+Param::~Param() {
+    auto strongChn= weak_chn.lock();
+    if (!strongChn) { return; }
+    VideoStackManager::Instance().unrefChannel(id, width, height, pixfmt); 
+}
 
 Channel::Channel(const std::string& id, int width, int height, AVPixelFormat pixfmt)
     : _id(id), _width(width), _height(height), _pixfmt(pixfmt) {