App crashes when resuming - java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

Describe the bug Admob shows banner ad without issues. But when app is resumed from background, the app crashes. The following is the error log:

W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@acc4c5
I/CordovaLog: Changing log level to DEBUG(3)
I/CordovaActivity: Apache Cordova native platform version 9.0.0 is starting
D/CordovaActivity: CordovaActivity.onCreate()
D/SystemWebViewEngine: CordovaWebView is running on device made by: samsung
D/PluginManager: init()
D/CDVLOGCAT: clearLog
D/Diagnostic: initialize()
D/Diagnostic_Location: initialize()
D/CordovaWebViewImpl: >>> loadUrl(file:///android_asset/www/index.html)
W/IMGSRV: glGetString:4370: Override GL_RENDERER PowerVR SGX Auckland 
D/CordovaActivity: Started the activity.
D/CordovaActivity: Resumed the activity.
V/InputMethodManager: Not IME target window, ignoring
D/OpenGLRenderer: eglCreateWindowSurface : 0x8498e160
    setSurface succeed. EglSurface(0x8498e160) ANativeSurface(0x849dbc28)
D/CordovaWebViewImpl: onPageDidNavigate(file:///android_asset/www/index.html)
I/InputMethodManager: startInputInner - mService.startInputOrWindowGainedFocus
D/JsMessageQueue: Set native->JS mode to EvalBridgeMode
D/CordovaWebViewImpl: onPageFinished(file:///android_asset/www/index.html#/)
I/chromium: [INFO:CONSOLE(1)] "Running cordova-android@9.0.0", source: file:///android_asset/www/js/app.d2c551eb.js (1)
I/AdMobPlus: Initialize plugin
D/AdMobPlus: Execute start
I/chromium: [INFO:CONSOLE(1)] "initialised store", source: file:///android_asset/www/js/app.d2c551eb.js (1)
I/chromium: [INFO:CONSOLE(175)] "OPEN database: lap", source: file:///android_asset/www/plugins/cordova-sqlite-storage/www/SQLitePlugin.js (175)
D/AdMobPlus: Execute ready
V/SQLitePlugin: Android db implementation: built-in android.database.sqlite package
V/info: Open sqlite db: /data/user/0/com.test.New/databases/lap
D/AdMobPlus: Execute bannerLoad
D/DynamitePackage: Instantiating com.google.android.gms.ads.ChimeraAdManagerCreatorImpl
W/IMGSRV: glGetString:4370: Override GL_RENDERER PowerVR SGX Auckland 
I/Ads: Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("2A148C5533F9CDF0CEFEFEE52905957B")) to get test ads on this device.
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z (greylist, linking, allowed)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z (greylist, linking, allowed)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z (greylist, linking, allowed)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z (greylist, linking, allowed)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z (greylist, linking, allowed)
D/AdMobPlus: Execute bannerShow
I/chromium: [INFO:CONSOLE(179)] "OPEN database: lap - OK", source: file:///android_asset/www/plugins/cordova-sqlite-storage/www/SQLitePlugin.js (179)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->putInt(Ljava/lang/Object;JI)V (greylist, linking, allowed)
D/InputMethodManager: HSIFW - flag : 0 Pid : 8091
W/com.test.New: Accessing hidden method Lsun/misc/Unsafe;->putLong(Ljava/lang/Object;JJ)V (greylist, linking, allowed)
    Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.test.New, PID: 8091
    java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
        at android.view.ViewGroup.addViewInner(ViewGroup.java:5109)
        at android.view.ViewGroup.addView(ViewGroup.java:4938)
        at android.view.ViewGroup.addView(ViewGroup.java:4878)
        at android.view.ViewGroup.addView(ViewGroup.java:4851)
        at admob.plugin.ads.Banner.addBannerViewWithLinearLayout(Banner.java:242)
        at admob.plugin.ads.Banner.addBannerView(Banner.java:216)
        at admob.plugin.ads.Banner.show(Banner.java:119)
        at admob.plugin.AdMob.lambda$executeBannerShow$2(AdMob.java:132)
        at admob.plugin.-$$Lambda$AdMob$wJNZf60vjGVhPuuLD_h6x-vXPpM.run(Unknown Source:2)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7438)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:989)
I/Process: Sending signal. PID: 8091 SIG: 9

Environment

AdMob Plus Environment Info:
    System:
      OS: Linux 5.4 Ubuntu 20.04.2 LTS (Focal Fossa)
      CPU: (8) x64 Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
      Memory: 415.91 MB / 7.65 GB
      Shell: 5.0.17 - /bin/bash
    Binaries:
      Node: 14.16.1 - /usr/bin/node
      npm: 6.14.12 - /usr/bin/npm
    Languages:
      Java: 1.8.0_271 - /usr/bin/javac
    npmPackages:
      admob-plus-cordova: ^1.5.1 => 1.5.1 
      cordova-android: ^9.0.0 => 9.0.0 
      cordova-plugin-androidx-adapter: ^1.1.3 => 1.1.3 
      cordova-plugin-custom: file:custom_plugins/cordova-plugin-custom => 1.0.0 
      cordova-plugin-device: ^2.0.3 => 2.0.3 
      cordova-plugin-dialogs: ^2.0.2 => 2.0.2 
      cordova-plugin-email-composer: ^0.9.2 => 0.9.2 
      cordova-plugin-geolocation: ^4.1.0 => 4.1.0 
      cordova-plugin-native-logs: ^1.0.5 => 1.0.5 
      cordova-plugin-request-location-accuracy: ^2.3.0 => 2.3.0 
      cordova-plugin-whitelist: ^1.3.4 => 1.3.4 
      cordova-sqlite-storage: ^5.1.0 => 5.1.0 
      cordova.plugins.diagnostic: ^6.0.3 => 6.0.3 
    npmGlobalPackages:
      cordova: 10.0.0
    Cordova:
      Version: 10.0.0
      Plugins:
        cordova-plugin-whitelist: ^1.3.4
        cordova-plugin-geolocation: ^4.1.0
        cordova-plugin-dialogs: ^2.0.2
        cordova.plugins.diagnostic: ^6.0.3
        cordova-plugin-device: ^2.0.3
        cordova-plugin-request-location-accuracy: ^2.3.0
        cordova-plugin-native-logs: ^1.0.5
        cordova-plugin-email-composer: ^0.9.2
        cordova-plugin-androidx-adapter: ^1.1.3
        cordova-sqlite-storage: ^5.1.0
        admob-plus-cordova: ^1.5.1
        cordova-plugin-custom: file:custom_plugins/cordova-plugin-custom
    Ionic:
      Version: 6.10.1
    AndroidManifest.xml:
      <meta-data android:name="com.google.android.gms.ads.APPLICATION_ID" ... />: looks ok

Additional context The following code is run whenever the app resumes from background:

let banner;

document.addEventListener("admob.ready", showBannerAd, false);

async function showBannerAd() {
  banner = new admob.BannerAd({
    adUnitId: "ca-app-pub-3940256099942544/6300978111",
    size: "MEDIUM_RECTANGLE",
  });
  await banner.show();
}

[ajprok]

The latest version resolves this issue.

@1n3JgKl9pQ6cUMrW Thank you very much for your support.

@ratson Thank you for this great plugin, and the amazingly fast fix.

Wishing you both well. 😃

[ratson]

@1n3JgKl9pQ6cUMrW You are the champion, I am able to see the error occasionally with the steps.