diff --git a/src/mc/src/mc.cpp b/src/mc/src/mc.cpp
index fd9c3bd..9019119 100644
--- a/src/mc/src/mc.cpp
+++ b/src/mc/src/mc.cpp
@@ -101,7 +101,7 @@ void receiveHandler(const CANFrame &frame, void *userData)
   publisher->publish(msg);
 
   // 根据开关决定是否打印 CAN 消息
-  if (g_can_print_enable)
+  if (g_can_print_enable && len > 0)
   {
     std::stringstream ss;
     ss << "CAN ID: ";