@spider,

You seemed to be creating chart everytime you click on the button. I would suggest you to create chart once, outside graphGenerate method and update the chart within the method. Also kindly confirm whether the y-values are numeric or not.

If this doesn’t help you resolve the issue, kindly share sample project over Google-Drive / Onedrive so that we can run it locally at our end, understand the scenario better and help you out.

——
Manoj Mohan
Team CanvasJS