@Awk34 The project is build in jit or aot?
if is in jit, how i build project with AOT?

Hello,
for enable AOT i install:
"@angular/cli": "^6.2.9",
"@angular/compiler-cli": "^6.1.10",
"@ngtools/webpack": "^1.10.2",
in webpack.make.js:
config.module = { rules: [ { test: /(\.ngfactory\.js|\.ngstyle\.js|\.ts)$/, loader: '@ngtools/webpack' }, .......

config.plugins = [ new AngularCompilerPlugin({ tsConfigPath: './tsconfig.json', mainPath: './client/app/app', entryModule: './client/app/app.module#AppModule', sourceMap: true, skipCodeGeneration: BUILD ? false : true }),......
i replace ALL components templates and styles
example:
template: require('./home') to templateUrl: './home'
styles: [require('./main.scss')] to styleUrls: ['./main.scss'],

this code enable AOT only in production mode, in development mode use JIT.

PS: if doesn't work, combines the packages versions.

I used Angular 6.0.4 and it works. i hope this help