fix

src/components/ChartView.vue

@@ -33,7 +33,8 @@ export default {
           yAxisID:         index,
           borderColor:     y.color,
           backgroundColor: y.fill,
-          spanGaps:        true
+          spanGaps:        true,
+          lineTension:     0
         };
         let last = null;
         for (let i = 0; i < this.data.length; i++) {
@@ -60,7 +61,6 @@ export default {
       return {
         animation:                   { duration: 0 },
         responsiveAnimationDuration: 0,
-        lineTension:                 0,
         scales:                      {
           yAxes:                       this.yaxis.map (
             (y, index) => {