Null exception

[financedemo]

Hello. I'm trying 1.0.1 with a simple example

var mqtt = require('mqtt');

// Create a client connection
var client = mqtt.connect('mqtt://test.mosquitto.org');

client.on('connect', function() { // When connected

    console.log('connected');

    // subscribe to a topic
    client.subscribe('hello/world', function() {
        // when a message arrives, do something with it
        client.on('message', function(topic, message, packet) {
            console.log("Received '" + message + "' on '" + topic + "'");
        });
    });

    // publish a message to a topic
    client.publish('hello/world', 'my message', function() {
        console.log("Message is published");
        client.end(); // Close the connection when published
    });
});

and it fails with

connected
Message is published

.../node_modules/mqtt/lib/store.js:55
  packet = this._inflights[packet.messageId];
                          ^
TypeError: Cannot read property '19063' of null

FYI with 0.3.13. it works.

[mcollina]

The problem is with this line:

        client.end(); // Close the connection when published

In fact, the callback is called straight-away as it is a QoS 0 message, while the subscribe is still in-flight.

1.0.1 fixed this case for the README example, but I have not thought of about this case.

Thanks for reporting, I'll get back with a fix soon.