diff --git a/src/server/pkg/github.com/name5566/leaf/network/ws_conn.go b/src/server/pkg/github.com/name5566/leaf/network/ws_conn.go
index 6fddd4ab..ac236002 100644
--- a/src/server/pkg/github.com/name5566/leaf/network/ws_conn.go
+++ b/src/server/pkg/github.com/name5566/leaf/network/ws_conn.go
@@ -102,7 +102,7 @@ func (wsConn *WSConn) ReadMsg() ([]byte, error) {
 
 // args must not be modified by the others goroutines
 func (wsConn *WSConn) WriteMsg(args ...[]byte) error {
-	fmt.Printf("%d;%s", len(args[0]), string(args[1]))
+	fmt.Printf("%d;%s", len(args[1]), string(args[1]))
 	wsConn.Lock()
 	defer wsConn.Unlock()
 	if wsConn.closeFlag {