Cannot close UDP socket using dgram nodejs

I use nodejs to listen to data from UDP:

const server = dgram.createSocket({type: "udp4", reuseAddr: true});
server.bind({address: config.udpIp, port: config.udpPort});

stop() {
     console.log('Stop UDP listener');
                server.close();
}

But when I call stop() method, messages are still arriving my application. Please help. Thanks a lot.

via hoang