pm2 launchBus() child process sending message after exit

child.js

process.send({
  type : 'process:msg',
  data : {id:process.pid}
});

process.disconnect();
process.exit();

spawn.js

var pm2Config = {
				"apps": [{
					"name": suiteSettings.testName + '_index_' + i,
					"script": path.normalize('./runners/child.js'),
					"error_file": reportDir + "err.log",
					"autorestart": false,
					maxRestarts: 1,
					"args": [
						'--reportDir=' + suiteSettings.reportDir,
						'--reportName=' + suiteSettings.suiteName,
						'--reportTitle=' + suiteSettings.capabilities.browserName,
						'--capabilities=' + JSON.stringify(suiteSettings.capabilities),
						'--screenshotDir=' + suiteSettings.screenshotDir,
						'--loopIndex=' + (count),
						'--urlData=' + JSON.stringify(suiteSettings.urlData),
						'--stage=prod',
						// '--test=' + test,
						'--color']
				}]
			};

			pm2.connect(function (err) {

				if (err) {
					console.error(err);
					process.exit(2);
				}
				pm2.start(pm2Config, function (err, proc) {
					if (err) throw err;
					pm2.launchBus(function (err, bus) {
						bus.on('process:msg', function (packet) {
							console.log(packet.id); //output repeats child id multiple times even after child exits
						}); // end bus on message
						return resolve();
					});// end launch bus

				}); // end start
			});