关机时崩溃（可能是finishActivityAffinity）

Question

在完成活动的同时，某些设备的错误率会降低。 Android：5.1.1

此行的完成活动低于错误 ActivityCompat.finishAffinity（this）;

 java.lang.NullPointerException: Attempt to read from field 'com.android.server.am.TaskRecord com.android.server.am.ActivityRecord.task' on a null object reference
    at android.os.Parcel.readException(Parcel.java:1552)
    at android.os.Parcel.readException(Parcel.java:1499)
    at android.app.ActivityManagerProxy.finishActivityAffinity(ActivityManagerNative.java:2790)
    at android.app.Activity.finishAffinity(Activity.java:4752)
    at com.frostwire.android.gui.activities.MainActivity.shutdown(MainActivity.java:177)
    at com.frostwire.android.offers.Offers$AdNetworkHelper.dismissAndOrShutdownIfNecessary(Offers.java:280)
    at com.frostwire.android.offers.AppLovinInterstitialAdapter.adHidden(AppLovinInterstitialAdapter.java:119)
    at com.applovin.adview.AppLovinInterstitialActivity.c(Unknown Source)
    at com.applovin.adview.AppLovinInterstitialActivity.dismiss(Unknown Source)
    at com.applovin.adview.q.onClick(Unknown Source)