[Chartjs]-Chart.js pie chart issue with display: none

There’s currently a bug in chart.js: https://github.com/nnnick/Chart.js/issues/592

Try to skip chart rendering if the element is not visible

if ($(".visitorsChart").is(":visible")) {
  var ctx = $(".visitorsChart").get(0).getContext("2d");
  var myPieChart = new Chart(ctx).Pie(data,{});
}