Bugfix

mean-app/dist/main.bundle.js

@@ -559,7 +559,9 @@ var LineChartComponent = (function () {
         this.lineChartData = newDataSet;
     };
     LineChartComponent.prototype.ngOnChanges = function () {
-        this.chart.chart.update();
+        if (this.chart.chart != undefined) {
+            this.chart.chart.update();
+        }
     };
     __decorate([
         __webpack_require__.i(__WEBPACK_IMPORTED_MODULE_0__angular_core__["Input"])(), 

mean-app/src/app/chart.component.ts

@@ -55,7 +55,10 @@ export class LineChartComponent implements OnInit, OnChanges {
   }
 
   ngOnChanges(): void {
-    this.chart.chart.update();
+    if(this.chart.chart != undefined){
+      this.chart.chart.update();
+    }
+    
   }