ZingChart：看不懂财产＆＃39; FA＆＃39;未定义的（在任何图表事件上）

Question

大约有20％的时间我用这个ZingChart加载一个页面，当我鼠标悬停或点击我的馅饼ZingChart上的一个节点时，我收到以下错误：

VM57:1 Uncaught TypeError: Cannot read property 'FA' of undefined
    at HTMLAreaElement.m.YS (eval at <anonymous> (http://cdn.zingchart.com/zingchart.min.js:8:1), <anonymous>:1:439813)
    at HTMLDocument.d (eval at <anonymous> (http://cdn.zingchart.com/zingchart.min.js:8:1), <anonymous>:1:89798)

在缩小的js chrome调试器中突出显示以下行：

t(p[0]-v,p[1]-u);if(r&&m.E["node-target-id"]&&m.E["node-target-id"]!==r.id){return}}if(ZC.N.R2(q.target).indexOf("zc-node-area")===-1){return}if(m.L1!=="ready"){return}if(ZC.mobile){m.A.N6(q)}var n=b(q);var o=m.AY.A

其他时候它会表现得像预期的那样。刷新页面通常（但不是每次）看到问题消失。我希望这是我实施的一个问题。

图表：

$scope.SalesChartData = {
        type: "pie",
        id: 'chart_1',
        title: {
          textAlign: 'center',
          text: "Loading..."
        },
        "legend":{
          "border-width":1,
          "border-color":"gray",
          "border-radius":"5px",            
          "marker":{
            "type":"circle"
          },
          "toggle-action":"remove",
          "icon":{
            "line-color":"#9999ff"
          }
        },   
        "plot": {
          "animation":{
            "on-legend-toggle": true,
            "effect": 5,
            "method": 1,
            "sequence": 1,
            "speed": 0.7
          },
          "value-box": {
            "text": "$%v",
            "negation": "currency",
            "thousands-separator": ",",
            "font-color": "black",
            "placement":"in",
            "offset-r":"50%",
            "font-size":"12"            
          },
          "tooltip":{
            "text":"%t: $%v (%npv%)",
            "thousands-separator":","
          },
          "decimals": "0",
          "detach": false
        },
        series: [],
        shapes: [{
          type: 'triangle',
          backgroundColor: '#66ccff',
          size: 10,
          angle: -90,
          x: 20,
          y: 20,
          cursor: 'hand',
          id: 'backwards'
        }]
      };

初始化数据并显示：

dataService.getRevenueByRegion($scope.yr,$scope.mnth).success(function(data) {

      for (var i = 0; i < data.length; i++) {
        $scope.SalesData.push({Revenue: [data[i].Revenue], Region: [data[i].Region], GP: [data[i].GP], Picks: [data[i].Picks], LocalBuyin: [data[i].LocalBuyin], detail: []});        
      }      

      displayRevenueByRegion();
    });

displayRevenueByRegion：

function displayRevenueByRegion(){

      $scope.SalesChartData.title.text="Revenue by Branch";
      $scope.SalesChartData.series=[];
      for (var i = 0; i < $scope.SalesData.length; i++) {
        $scope.SalesChartData.series.push({values: $scope.SalesData[i].Revenue, text: $scope.SalesData[i].Region, GP: $scope.SalesData[i].GP, Picks: $scope.SalesData[i].Picks, LocalBuyin: $scope.SalesData[i].LocalBuyin});
      }

      zingchart.exec('chart_1', 'destroy');

      zingchart.render({ 
        id : 'chart_1', 
        data : $scope.SalesChartData      
      });

      zingchart.exec('chart_1', 'update');

    }