bun start crash - TypeError: undefined is not an object at terminate() about bun HOT 2 OPEN

   const pingInterval = keepAlive > 0 && isFinite(keepAlive)
            ? setInterval(() => {
                // ping pong on open sockets only
                if (socket.readyState === socket.OPEN) {
                    // terminate the connection after pong wait has passed because the client is idle
                    pongWait = setTimeout(() => {
                        socket.terminate();
                    }, keepAlive);
                    // listen for client's pong and stop socket termination
                    socket.once('pong', () => {
                        if (pongWait) {
                            clearTimeout(pongWait);
                            pongWait = null;
                        }
                    });
                    socket.ping();
                }
            }, keepAlive)
            : null;