score:1

Accepted answer

Enable the connectNulls option:

series: [{
    data: [...],
    connectNulls: true
}]

Live demo: http://jsfiddle.net/BlackLabel/fheb9yp5/

API Reference: https://api.highcharts.com/highcharts/series.line.connectNulls

score:0

can you show us how your data shows up? if the null values ​​have a meaning in your treatments I suggest you change the type of graph or replace the null values ​​by zero


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