We're running our nalwin with the /s option so that users can't close it, but it seems to make it a little unstable at logoff/shutdown. We sometimes get the following message appear, nothing else appears in event viewer

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nalwin.exe - Application Error
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Application has generated an exception that could not be handled.

Process ID=0xf18 (3864), Thread ID=0x3a8 (936).

Click OK to terminate the application.
Click CANCEL to debug the application.
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OK Cancel
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Anyone got any idea what might be causing this?