db.js

var Promise = require('bluebird');
Promise.longStackTraces();
var pg = Promise.promisifyAll(require('pg'));
var connString = '****************************************';

module.exports.getSubscribers = function() {
	return pg.connectAsync(connString).bind({}).then(function(client, done) {
		this.done = done;
		return Promise.promisifyAll(client).queryAsync('SELECT * FROM subscribers');
	}).then(function(res) {
		this.done();
		return res;
	}).finally(function() {
		pg.end();
	});
};

error.bash

Possibly unhandled TypeError: Object [object Object],function (err) {
    at Object.<anonymous> (/modules/db.js:9:39)
From previous event:
    at connectAsync (eval at makeNodePromisifiedEval (/node_modules/bluebird/js/main/promisify.js:198:12), <anonymous>:2:125)