Highcharts.chart('container', {
    chart: {
        polar: true
    },
    title: {
        text: 'The line doesn\'t connect'
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },

    yAxis: {
        min: 0
    },

    series: [{
        data: [129.9, 111.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 175.6, 154.4],
        connectEnds: false
    }]
});