diff --git a/f8/netmsghandler.h b/f8/netmsghandler.h
index 7b7a740..474bfb7 100644
--- a/f8/netmsghandler.h
+++ b/f8/netmsghandler.h
@@ -19,6 +19,11 @@ namespace f8
 
     struct NetMsgHandler
     {
+        virtual ~NetMsgHandler()
+        {
+
+        }
+
         int handlerid;
         const ::google::protobuf::Message* prototype = nullptr;
         CUSTOM_PARSER custom_parser = nullptr;
diff --git a/f8/udplog.cc b/f8/udplog.cc
index 61a2adf..6954768 100644
--- a/f8/udplog.cc
+++ b/f8/udplog.cc
@@ -71,7 +71,7 @@ namespace f8
         delete impl_->save_thread;
         impl_->save_thread = nullptr;
         impl_->msg_mutex.lock();
-        if (impl_->work_node) {
+        if (!impl_->work_node) {
             impl_->work_node = impl_->top_node;
             impl_->top_node = nullptr;
             impl_->bot_node = nullptr;