Accepted answer

The issue is related to Highcharts callback functions. Inside click callback this points to chart series, not component object.

Try this solution:

point: {
  events: {
    click: (function(self) {
      return function() {
        // this as Highcharts series
        var month = this.category;

        // self - reference to the component object
        self.filterHzdlisting('hzrdtrend', month, 66);

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