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ERROR in Cannot read property 'push' of undefined

See original GitHub issue

Error while compiling for Angular 9:

$ ng build --configuration=my-prod-config
0% compiling
Compiling @ngx-translate/core : es2015 as esm2015

Compiling @angular/common/http : es2015 as esm2015

Compiling @ngx-translate/http-loader : es2015 as esm2015



ERROR in Cannot read property 'push' of undefined

Environment:

@ngx-translate/core@12.1.1
@ngx-translate/http-loader@4.0.0

$ ng version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 9.0.3
Node: 13.1.0
OS: linux x64

Angular: 9.0.3
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.900.3
@angular-devkit/build-angular     0.900.3
@angular-devkit/build-optimizer   0.900.3
@angular-devkit/build-webpack     0.900.3
@angular-devkit/core              9.0.3
@angular-devkit/schematics        9.0.3
@angular/cdk                      9.1.0
@angular/flex-layout              9.0.0-beta.29
@angular/material                 9.1.0
@ngtools/webpack                  9.0.3
@schematics/angular               9.0.3
@schematics/update                0.900.3
rxjs                              6.5.4
typescript                        3.7.5
webpack                           4.41.2