Remember to cover the basics, that is, what you expected to happen and what in fact did happen. You don't know how to make a good report? See
https://orgmode.org/manual/Feedback.html#Feedback Your bug report will be posted to the Org mailing list. ------------------------------------------------------------------------ I did org-cycle, via S-TAB, and an error occurred. I don't know why. Emacs : GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27, cairo version 1.17.4) of 2021-03-26 Package: Org mode version 9.5.1 (release_9.5.1-205-g20ed79 @ /home/jay/Builds/org-mode/lisp/)