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You seemed to be using chart within getData method but which is undefined as its not passed when the function is called. Passing chart as parameter to getData method should work fine in your case getData(chart);.
It would be helpful for us to understand your scenario better when we look at your code working live in jsfiddle. So I kindly request you to create jsfiddle and share it with us if you find any issue working in CanvasJS in future.