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In case of line / spline chart, by default line will be broken when datapoint with null value is present. You can connect the non-null values directly by setting connectNullData property to true – which draws a dashed line to connect non-null datapoints. The type of this line can be changed by setting nullDataLineDashType property. Please refer to the code-snippet below.

data: [{
	type: "line",
	connectNullData: true,
	nullDataLineDashType: "solid",

Connect Null Data in Line Charts
Please take a look at this updated JSFiddle for complete code.

Vishwas R
Team CanvasJS