Uncaught TypeError: (intermediate value).fill is not a function

while working with ionic 4 .when i am running my app in android version-8.1.0 it working well but below versions like 5.1.1 it is not working it giving Uncaught TypeError: (intermediate value).fill is not a function in vendor.js


ionic (Ionic CLI) : 4.7.1 (C:\Users\Ranjith\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : @ionic/angular 4.0.0-rc.0
@angular-devkit/build-angular : 0.12.0
@angular-devkit/schematics : 7.1.4
@angular/cli : 7.1.4
@ionic/angular-toolkit : 1.2.2


cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)
Cordova Platforms : android 7.1.4, browser 5.0.4
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.0.0, (and 7 other plugins)


NodeJS : v10.15.0 (C:\Program Files\nodejs\node.exe)
npm : 6.5.0
OS : Windows 10

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Same problem here… How can we solve this problem. please help

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same problem here with cordova 8.0 and cordova-plugin-ionic-webview 4.0.1

Same problem. This is very frustrating.
I lost the whole day now debugging this.

We have Android TV boxes (Android 6.0 - Android 8.0) which already worked with a previous version of our app (ionic 4)

Now, since the last time i updated npm & ionic the Android 6.0 boxes are stuck on a blank screen and throw this error (Tested with cordova-android@6 - cordova-android@8). Android 7+ boxes are working without any problem. The Android 6.0 boxes are working with the older ionic3 version of our app without problems.

Any ideas?