Multi tool use

java.lang.IllegalStateException: sending message to a Handler on a dead thread

I have developed a game which makes use of lots of handlers.I am using admob interstitial ads.When a game level is cleared i show the interstitial ad but when i close the ad exception is thrown which i am not able to figure out

The Exception is thrown only when i close the interstitial ad.

Code :

collectORCancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isCollectPressed = true;
soundPlayer.playClickSound();
Utils.getInstance().playClickAnimation(v);
handler.postDelayed(new Runnable() {
@Override
public void run() {
addCandy();
dialog.dismiss();
getActivity().getSupportFragmentManager().popBackStack();

handler.postDelayed(new Runnable() {
@Override
public void run() {
Utils.getInstance().showInterStitialAd(BaseApp.getInstance());
}
},800);

}
},300);
}
});


The Exception is :

java.lang.IllegalStateException: Handler (android.os.Handler) {883c1c2} sending message to a Handler on a dead thread
at android.os.MessageQueue.enqueueMessage(MessageQueue.java:543)
at android.os.Handler.enqueueMessage(Handler.java:634)
at android.os.Handler.sendMessageAtTime(Handler.java:600)
at android.os.Handler.sendMessageDelayed(Handler.java:570)
at android.os.Handler.sendEmptyMessageDelayed(Handler.java:534)
at android.os.Handler.sendEmptyMessage(Handler.java:519)
at com.google.android.gms.ads.internal.video.exoplayer1.f.b(:com.google.android.gms.dynamite_dynamitemodulesa@12685024@12.6.85 (040406-197041431):174)
at com.google.android.gms.ads.internal.webview.t.u(:com.google.android.gms.dynamite_dynamitemodulesa@12685024@12.6.85 (040406-197041431):22)
at com.google.android.gms.ads.internal.webview.j.onPageFinished(:com.google.android.gms.dynamite_dynamitemodulesa@12685024@12.6.85 (040406-197041431):84)
at com.android.webview.chromium.WebViewContentsClientAdapter.onPageFinished(WebViewContentsClientAdapter.java:224)
at org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.handleMessage(AwContentsClientCallbackHelper.java:72)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5555)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)


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