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Errors with TrackBall caused when not displaying markers

Hi,

We have configured a line series chart to display multiple series and are using the 'trackball' ability of the chart component to display information to the end user.

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With the markers visible on the data points - everything works absolutely wonderfully.

However if we hide the markers (visible: false) then we are faced with the console error below being raised everytime the mouse moves over a data point. 

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the tooltip still displays, but the errors continue to mount up.

I would really appreciate it if you could tell me know why and whether this is a bug or (hopefully) there is a workaround.