How do you create an extension to Chart.js?

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Your code expects different values for ctx in the main code vs. your extension. In your main code it seems like a DOM node and in your extension you are using it as a context.

Just add

  var ctx = this.chart.ctx;

after Chart.types.Line.prototype.draw.apply(this, arguments); and it should work. If not, check if your main code variables are all defined with correct values (start, end and ctx)

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