Compiling problems with --prod

#1

Hello, if I compile my App with ionic cordova build android --prod I get an error in my console log saying the following:

Unhandled Promise rejection: StaticInjectorError(n)[t -> e]: 
  StaticInjectorError(Platform: core)[t -> e]: 
    NullInjectorError: No provider for e! ; Zone: <root> ; Task: Promise.then ; Value: Error: StaticInjectorError(n)[t -> e]: 
  StaticInjectorError(Platform: core)[t -> e]: 
    NullInjectorError: No provider for e!
    at t.get (vendor.js:1)
    at vendor.js:1
    at _ (vendor.js:1)
    at t.get (vendor.js:1)
    at vendor.js:1
    at _ (vendor.js:1)
    at t.get (vendor.js:1)
    at re (vendor.js:1)
    at t.get (vendor.js:1)
    at Te (vendor.js:1) Error: StaticInjectorError(n)[t -> e]: 
  StaticInjectorError(Platform: core)[t -> e]: 
    NullInjectorError: No provider for e!
    at t.get (file:///android_asset/www/build/vendor.js:1:58192)
    at file:///android_asset/www/build/vendor.js:1:10256
    at _ (file:///android_asset/www/build/vendor.js:1:10280)
    at t.get (file:///android_asset/www/build/vendor.js:1:58973)
    at file:///android_asset/www/build/vendor.js:1:10256
    at _ (file:///android_asset/www/build/vendor.js:1:10280)
    at t.get (file:///android_asset/www/build/vendor.js:1:58973)
    at re (file:///android_asset/www/build/vendor.js:1:25967)
    at t.get (file:///android_asset/www/build/vendor.js:1:108151)
    at Te (file:///android_asset/www/build/vendor.js:1:31315)

I’ve never needed to import Platform from ionic-angular to providers and this isn’t happening if I compile with --prod

My Ionic info is:

cli packages: (C:\...\node_modules)

    @ionic/cli-utils  : 1.19.3
    ionic (Ionic CLI) : 3.20.1

global packages:

    cordova (Cordova CLI) : 7.1.0

local packages:

    @ionic/app-scripts : 3.1.10
    Cordova Platforms  : android 6.3.0
    Ionic Framework    : ionic-angular 3.9.2

System:

    Android SDK Tools : 26.1.1
    Node              : v8.11.1
    npm               : 6.8.0
    OS                : Windows 10

Environment Variables:

    ANDROID_HOME : C:\Users\...\AppData\Local\Android\Sdk

Misc:

    backend : pro

What can be causing this?

Thanks