listServices works only with callback style

[lifeisfoo]

This works as expected:

docker.listServices({}, (err, services) => {/*ok*/});

This doesn't:

docker.listServices({})
    .then(function(services) {
        //
    }).catch(function(err) {
        //always an empty error
    });

Using dockerode 2.5.7 from npm.

[apocas]

Can't replicate this.
18.09.0-ce-beta1