java.lang.NullPointerException
	at android.view.WindowManagerImpl.removeViewLocked(WindowManagerImpl.java:239)
	at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:201)
	at android.view.Window$LocalWindowManager.removeView(Window.java:432)
	at android.app.Dialog.dismissDialog(Dialog.java:296)
	at android.app.Dialog.access$000(Dialog.java:82)
	at android.app.Dialog$1.run(Dialog.java:118)
	at android.app.Dialog.dismiss(Dialog.java:280)
	at com.facebook.android.FbDialog$FbWebViewClient.onPageFinished(FbDialog.java:171)
	at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:245)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:214)
	at android.app.ActivityThread.main(ActivityThread.java:4415)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:521)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
	at dalvik.system.NativeStart.main(Native Method)