javascript - Using Highcharts formatter causes Cannot read property 'length' of undefined -


i want display custom text in tooltip. when use code, got cannot read property 'length' of undefined when hover on tooltip.

does knows where's problem?

tooltip: {             shared: false,             formatter: function() {                 var serie = this.series;                 var s = '<span style="color:' + serie.color + '">' + serie.options.name + '</span>: <b>' + this.y + '</b><br/>';                 $.each(serie.options.composition, function(name, value) {//error pop ups here                     s += '<b>' + name + ':</b> ' + value + '<br>';                 });                 return s;             }         }

edit - added error message:

    uncaught typeerror: cannot read property 'length' of undefinedm.extend.each @ jquery.min.js:2$.highcharts.tooltip.formatter @ grafovi.php:823mb.refresh @ highcharts.js:160va.runpointactions @ highcharts.js:166va.oncontainermousemove @ highcharts.js:174va.setdomevents.b.onmousemove @ highcharts.js:176

as comment check serie.options.composition exists , array.


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