Crash on exit when releasing Decklink* after closing window

This error occurs on Windows. My code is based on the CapturePreview sample.

If I stop or release a Decklink device (IDeckLinkInputCallback), or a DecklinkDiscovery object (IDeckLinkDeviceNotificationCallback) after my application window has been closed, I reliably get an access violation crash, even though the object pointers are not NULL. Is there any possibility that the Blackmagic SDK relies on Windows OS event that interferes with my destruction order?

Any ideas?

I'm able to replicate the issue in the sample by moving the CCapturePreviewDlg::OnClose() implementation to a destructor: read access violation on m_deckLinkInput.

In my application, I can also connect my release calls to a closed window signal. However even after doing so, I still get rare occasional crashes on exit for some reason.