IllegalArgumentException crashes

[argilo]

An IllegalArgumentException crash has been reported, with two variations of the stack trace (below). I don't yet know how to reproduce this, but it's probably happening when something changes as trips are being fetched. Probably a fix needs to be made in FetchTripsTask.onPostExecute.

java.lang.IllegalArgumentException: View not attached to window manager
at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:672)
at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:368)
at android.view.WindowManagerImpl$CompatModeWrapper.removeView(WindowManagerImpl.java:160)
at android.app.Dialog.dismissDialog(Dialog.java:319)
at android.app.Dialog.dismiss(Dialog.java:302)
at net.argilo.busfollower.FetchTripsTask.onPostExecute(FetchTripsTask.java:102)
at net.argilo.busfollower.FetchTripsTask.onPostExecute(FetchTripsTask.java:1)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4918)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
at dalvik.system.NativeStart.main(Native Method)

java.lang.IllegalArgumentException: View not attached to window manager
at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:751)
at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:474)
at android.view.WindowManagerImpl$CompatModeWrapper.removeView(WindowManagerImpl.java:163)
at android.app.Dialog.dismissDialog(Dialog.java:348)
at android.app.Dialog$1.run(Dialog.java:139)
at android.app.Dialog.dismiss(Dialog.java:333)
at net.argilo.busfollower.FetchTripsTask.onPostExecute(FetchTripsTask.java:102)
at net.argilo.busfollower.FetchTripsTask.onPostExecute(FetchTripsTask.java:1)
at android.os.AsyncTask.finish(AsyncTask.java:602)
at android.os.AsyncTask.access$600(AsyncTask.java:156)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:4895)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)