Accepted answer

Highcharts draws a line only between two subsequent no-null points. Single points can be visualized as markers (which you disabled in your code).

Here's a live demo that shows this issue:

  series: [{
    data: [1, 2, null, 4, null, 1, 7],
    marker: {
        //enabled: false // uncomment to hide markers

API reference:


It seems to work fine in the latest version of Highcharts. The data points are visible.

Please have a look

Visible points:

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