In [emacs-w3m:13716] On Tue, 22 Dec 2020 04:25:39 -0500, Boruch Baum wrote: > function w3m-history-set-plist throws an error because its > arg PLIST is NIL instead of being an expected (nil nil). How exactly > this happened in the first place is unclear to me, but the following > four additional lines (marked with '; <<---') fixes the issue. I've installed your fix with notes. Thank you for uncovering it.