QUnit.test('Single point is null (#6637)', function (assert) {
    var chart = Highcharts.chart('container', {
        chart: {
            type: 'bubble'
        },

        series: [
            {
                data: [
                    { x: 95, y: null, z: 13.8, name: 'BE', country: 'Belgium' },
                    {
                        x: 86.5,
                        y: 102.9,
                        z: 14.7,
                        name: 'DE',
                        country: 'Germany'
                    }
                ]
            }
        ]
    });

    assert.strictEqual(
        typeof chart.series[0].points[1].graphic,
        'object',
        'Series is displayed.'
    );
});
