JS console:
chart.wpd:466 Uncaught Error: Highcharts error #18: www.highcharts.com/errors/18/
    at H.Chart.defaultHandler (chart.wpd:466:27)
    at H.fireEvent (chart.wpd:2442:33)
    at H.error (chart.wpd:487:19)
    at chart.wpd:30158:29
    at Array.forEach (<anonymous>)
    at obj.<anonymous> (chart.wpd:30118:46)
    at H.fireEvent (chart.wpd:2442:33)
    at obj.bindAxes (chart.wpd:30116:17)
    at obj.init (chart.wpd:29972:24)
    at H.Chart.initSeries (chart.wpd:24410:24)

final int xAxisIndex = xAxis == null ? -1 : xAxisMap.get(xAxis.getId());
final int yAxisIndex = yAxis == null ? -1 : yAxisMap.get(yAxis.getId());