I'm handling the MouseDown event on NChartControl and checking if the user clicked a DataPoint inside the handler:

NHitTestResult ht = nChartControl1.HitTest(e.X, e.Y);
if(ht.ChartElement == ChartElement.DataPoint)
{
    // do some stuff
}

The chart is also updated multiple times -- it is a scatter plot and I redraw it based on some parameters.

This works most of the time, but sometimes there's a NullReferenceException thrown by the HitTest call. nChartControl1 is not null and the event args have reasonable values.

Any idea what could be going wrong? Thanks.

Figured it out yesterday. I had been clearing the series collection on the chart without refreshing the chart. After that, any clicks on the chart resulted in a NullReferenceException from the HitTest method.

Hello Anna,

We will investigate this and see if we have to change something in the component (probably the exception type and message).

Thank you for your valuable feedback.

Best Regards,
Nevron Support Team