I don't have a simple recipe to preoduce the bug but it is simple enough to understand. While using the frameset--restore-frame function, it may happen that the modify-frame-parameters be called with a border-width which is not the default one for the current emacs. In this case, x_set_border_width errors because it can't change it. This happens if you restore a desktop which has been saved in another environment. I don't think that an error is needed here. At most a warning would be. Currently, it prevents restoring the desktop for no real reason. In GNU Emacs 26.0.60 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.18.9) of 2017-10-12 built on LOBSANG Repository revision: f352d0257ce5ca1d424b55fc179f18b81bd465ab Windowing system distributor 'Moba/X', version 11.0.11603000 System Description: Ubuntu 16.04.3 LTS Recent messages: Created bibtex link. Created papers link. uncompressing frameset.el.gz...done Loading /home/fabrice/.emacs.d/var/secrets.el (source)...done Turning on magit-auto-revert-mode...done uncompressing frameset.el.gz...done Wrote /home/fabrice/.emacs.d/savefile/.emacs.desktop.lock Desktop: 1 frame, 2 buffers restored. For information about GNU Emacs and the GNU system, type C-h C-a. 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