Personal record Meizu automated test error

[{"brandName":"魅族","failMsg":"// CRASH: com.xiaoluwa.ruika (pid 12223)
// Short Msg: java.lang.IllegalArgumentException
// Long Msg: java.lang.IllegalArgumentException: Receiver not registered: android.widget.ZoomButtonsController$1@d15da77
// Build Label: Meizu/meizu_PRO6/PRO6:7.1.1/NMF26O/1514175291:user/release-keys
// Build Changelist: 1514175291
// Build Time: 1514175969000
// java.lang.IllegalArgumentException: Receiver not registered: android.widget.ZoomButtonsController$1@d15da77
// \tat android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:1023)
// \tat android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1436)
// \tat android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:608)
// \tat android.widget.ZoomButtonsController.setVisible(ZoomButtonsController.java:404)
// \tat android.widget.ZoomButtonsController$2.handleMessage(ZoomButtonsController.java:178)
// \tat android.os.Handler.dispatchMessage(Handler.java:110)
// \tat android.os.Looper.loop(Looper.java:203)
// \tat android.app.ActivityThread.main(ActivityThread.java:6451)
// \tat java.lang.reflect.Method.invoke(Native Method)
// \tat com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1134)
// \tat com.android.internal.os.ZygoteInit.main(ZygoteInit.java:995)
// 

","modelName":"meizu_PRO6","osVersion":"Flyme 6.2.5.0A"}]

My solution is

@Override
protected void onDestroy() {
   super.onDestroy();
webView.setVisibility(View.GONE);
webView.destroy();
webView = null;
}