White screen in android 6.0.1 ionic 3

Hello every one , I have a strange problem just in android (v 6.0.1)
when app open it work normally …and after login white screen was showing and app stop on it. :confused:
any ideas ?
thanks

IONIC INFO -

Ionic:

ionic (Ionic CLI) : 4.2.1 (C:\Users\user\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : ionic-angular 3.9.2
@ionic/app-scripts : 3.2.0

Cordova:

cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)
Cordova Platforms : android 6.3.0
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.2, cordova-plugin-ionic-webview 2.1.0, (and 23 other plugins)

System:

Android SDK Tools : 25.2.3 (C:\Users\user\AppData\Local\Android\sdk)
NodeJS : v8.11.4 (C:\Program Files\nodejs\node.exe)
npm : 5.6.0
OS : Windows 10

Be clearer. Is it your app ? A blank app ? It fails only on device, not on computer ?
If so, did you try to inspect it with chrome to debug?

thank for your notes …
yes it’s my app not blank and its fails only on device android v 6.0.1 ,
yes i am inspect it but no error was showing . no thing happen after login just white screen