Expected behavior :Working charts as they did with version 6 from mdb and angular

Actual behavior: Before i updated our Project to Angluar 8.1.0, our charts worked perfectly fine, but since then, i can't see them anymore, because there is this weird new error in the chrome-console. My code and with the ng build --watch don't show me any any errors.

Resources (screenshots, code snippets etc.)

package.json:

    {   "name": "xxx",   "version": "0.0.0",   "license": "MIT",   "scripts": {
        "ng": "ng",
        "start": "ng serve",
        "build": "ng build",
        "test": "ng test",
        "lint": "ng lint",
        "e2e": "ng e2e"   },   "private": true,   "dependencies": {
        "@agm/core": "^1.0.0-beta.7",
        "@angular/animations": "^8.1.1",
        "@angular/cdk": "^8.0.2",
        "@angular/common": "^8.1.1",
        "@angular/compiler": "^8.1.1",
        "@angular/core": "^8.1.1",
        "@angular/forms": "^8.1.1",
        "@angular/http": "^7.2.15",
        "@angular/material": "^8.0.2",
        "@angular/material-moment-adapter": "^8.0.2",
        "@angular/platform-browser": "^8.1.1",
        "@angular/platform-browser-dynamic": "^8.1.1",
        "@angular/router": "^8.1.1",
        "@asymmetrik/ngx-leaflet": "^5.0.2",
        "@auth0/angular-jwt": "^2.1.1",
        "@material/top-app-bar": "^3.0.0",
        "@ng-bootstrap/ng-bootstrap": "^5.0.0",
        "@progress/kendo-angular-buttons": "^5.0.0",
        "@progress/kendo-angular-dateinputs": "^4.0.0",
        "@progress/kendo-angular-dropdowns": "^4.0.0",
        "@progress/kendo-angular-excel-export": "^3.0.0",
        "@progress/kendo-angular-grid": "^4.0.0",
        "@progress/kendo-angular-inputs": "^6.0.0",
        "@progress/kendo-angular-intl": "^2.0.0",
        "@progress/kendo-angular-l10n": "^2.0.0",
        "@progress/kendo-angular-label": "^2.0.0",
        "@progress/kendo-angular-sortable": "^3.0.0",
        "@progress/kendo-angular-upload": "^4.1.4",
        "@progress/kendo-data-query": "^1.5.1",
        "@progress/kendo-date-math": "^1.4.1",
        "@progress/kendo-drawing": "^1.5.12",
        "@progress/kendo-theme-default": "^4.0.0",
        "@progress/kendo-theme-material": "^3.0.0",
        "@progress/telerik-angular-report-viewer": "^7.19.618",
        "@types/leaflet": "^1.4.5",
        "angular-bootstrap-md": "^8.0.0",
        "angular-calendar": "^0.27.12",
        "angular-datepicker": "^1.0.5",
        "angular-md": "^1.0.0",
        "angular-responsive-tables": "^0.4.4",
        "angular2-jwt": "^0.2.3",
        "angularx-flatpickr": "^6.1.0",
        "bootstrap": "^4.3.1",
        "chart.js": "^2.7.3",
        "chartjs": "^0.3.24",
        "core-js": "^2.6.5",
        "date-fns": "^1.30.1",
        "flatpickr": "^4.6.1",
        "hammerjs": "^2.0.8",
        "jquery": "^3.4.1",
        "leaflet": "^1.5.1",
        "moment": "^2.24.0",
        "ngx-bootstrap": "^5.1.0",
        "ngx-color-picker": "^8.0.1",
        "ngx-editor": "^4.1.0",
        "ngx-mat-select-search": "^1.7.6",
        "ngx-permissions": "^7.0.3",
        "npm": "^6.10.1",
        "popper.js": "^1.15.0",
        "rxjs": "^6.5.2",
        "rxjs-compat": "^6.5.2",
        "typescript": "^3.4.5",
        "zone.js": "^0.9.1"   },   "devDependencies": {
        "@angular-devkit/build-angular": "^0.801.1",
        "@angular/cli": "^8.1.1",
        "@angular/compiler-cli": "^8.1.1",
        "@angular/language-service": "^8.1.1",
        "@types/jasmine": "~3.3.13",
        "@types/jasminewd2": "~2.0.6",
        "@types/node": "~12.6.2",
        "codelyzer": "~5.1.0",
        "jasmine-core": "~3.4.0",
        "jasmine-spec-reporter": "~4.2.1",
        "karma": "^4.1.0",
        "karma-chrome-launcher": "~2.2.0",
        "karma-cli": "~2.0.0",
        "karma-coverage-istanbul-reporter": "^2.0.5",
        "karma-jasmine": "~2.0.1",
        "karma-jasmine-html-reporter": "^1.4.2",
        "protractor": "^5.4.2",
        "ts-node": "~8.3.0",
        "tslint": "~5.18.0"   } }