617caf9e98d443c22cebc96a417b85a2bf8a8e56
This can happen when a device is already connected while Arodur is stating. The butler thread may activate it (immediately post-engine), while the GUI thread tries to do the same later when restoring state.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html
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