c# - Exception in System.Windows.Interop.HwndKeyboardInputProvider.FilterMessage() -


we're catching following exception field in our .net4 windows application. stack trace doesn't point code location in our app , don't know how reproduce problem. know because app reporting crash our servers. found similar stack trace issues related caliburn.micro, , issue started shortly after integrated cm our solution.

any ideas on should or how can reproduce this?

system.nullreferenceexception: object reference not set instance of object.           @ system.windows.interop.hwndkeyboardinputprovider.filtermessage(intptr hwnd, windowmessage message, intptr wparam, intptr lparam, boolean& handled)  @ system.windows.interop.hwndsource.inputfiltermessage(intptr hwnd, int32 msg, intptr wparam, intptr lparam, boolean& handled)  @ ms.win32.hwndwrapper.wndproc(intptr hwnd, int32 msg, intptr wparam, intptr lparam, boolean& handled)  @ ms.win32.hwndsubclass.dispatchercallbackoperation(object o)     @ system.windows.threading.exceptionwrapper.internalrealcall(delegate callback, object args, int32 numargs)  @ ms.internal.threading.exceptionfilterhelper.trycatchwhen(object source, delegate method, object args, int32 numargs, delegate catchhandler)


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