this.state.chart is undefined at componentWillReceiveProps #176

classData.componentWillReceiveProps = function(nextProps) {
var chart = this.state.chart; // can be undefined
if (chart) { // if not undefined then do the action
if (nextProps.redraw) {
chart.destroy();
this.initializeChart(nextProps);
} else {
dataKey = dataKey || dataKeys[chart.name];
updatePoints(nextProps, chart, dataKey);
if (chart.scale) {
chart.scale.xLabels = nextProps.data.labels;

          if (chart.scale.calculateXLabelRotation){
        chart.scale.calculateXLabelRotation();
          }
      }
      chart.update();
    }
  }
};