Crash happened when the app was closing

[amitakki]

android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@7e2116f is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java:954)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:381)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:100)
at android.app.Dialog.show(Dialog.java:420)
at com.box.androidsdk.content.auth.OAuthWebView$OAuthWebViewClient.onReceivedSslError(OAuthWebView.java:329)
at yk.a(PG:494)
at ajX.run(Unknown Source:2)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)