Hello org-mode developers

I received the following warning and was duly encouraged to file a bug 
report:

---

⛔ Warning (org-element-cache): org-element--cache: Org parser error in 
post-nz.org::7833. Resetting.
The error was: (wrong-type-argument integer-or-marker-p nil)
Backtrace:
nil
Please report this to Org mode mailing list (M-x org-submit-bug-report).

---

One of my top-level headers (with just one leading asterisk) failed to 
open. Switching to text mode showed that there was information to reveal.

I also noticed earlier that one of my top-level headers had managed to 
empty itself on two different occasions. I now watch the status bar to 
check that the file has not changed when doing tasks like narrowing to 
an org-mode subtree.

Sorry I cannot be more specific or insightful.

My thanks to the maintainers for this very useful utility.
-- 
Robbie Morrison
Schillerstraße 85
10627 Berlin
Germany

Your bug report will be posted to the Org mailing list.
------------------------------------------------------------------------

Emacs : GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
3.24.41, cairo version 1.18.0)
of 2024-04-01, modified by Debian
Package: Org mode version 9.6.15 (release_9.6.15 @ 
/usr/share/emacs/29.3/lisp/org/)

current state:
==============
(setq
org-link-elisp-confirm-function 'yes-or-no-p
org-directory "/home/robbie/synk/org"
org-bibtex-headline-format-function #[257 "\300\236A\207" [:title] 3 
"\n\n(fn ENTRY)"]
org-agenda-skip-scheduled-if-done t
org-persist-after-read-hook '(org-element--cache-persist-after-read)
org-export-before-parsing-hook '(org-attach-expand-links)
org-cycle-tab-first-hook '(org-babel-hide-result-toggle-maybe 
org-babel-header-arg-expand)
org-tag-alist '(("URGENT" . 117) ("@PHONE" . 112) ("@ERRANDS" . 101) 
("noexport" . 110))
org-default-notes-file "/home/robbie/synk/org/notes.org"
org-archive-hook '(org-attach-archive-delete-maybe)
org-cycle-hook '(org-cycle-hide-archived-subtrees 
org-cycle-show-empty-lines
org-cycle-optimize-window-after-visibility-change
org-cycle-display-inline-images)
org-persist-before-read-hook '(org-element--cache-persist-before-read)
org-mode-hook '(#[0 "\300\301\302\303\304$\207"
[add-hook change-major-mode-hook org-fold-show-all append local] 5]
#[0 "\300\301\302\303\304$\207"
[add-hook change-major-mode-hook org-babel-show-result-all append local] 5]
org-babel-result-hide-spec org-babel-hide-all-hashes
#[0 "\301\211\207" [imenu-create-index-function org-imenu-get-tree] 2]
robbie-org-mode-customization)
org-agenda-skip-deadline-if-done t
outline-minor-mode-hook '(mediawiki-outline-magic-keys)
org-confirm-shell-link-function 'yes-or-no-p
outline-isearch-open-invisible-function 'outline-isearch-open-invisible
org-agenda-before-write-hook '(org-agenda-add-entry-text)
org-src-mode-hook '(org-src-babel-configure-edit-buffer 
org-src-mode-configure-edit-buffer)
org-confirm-elisp-link-function 'yes-or-no-p
org-speed-command-hook '(org-speed-command-activate 
org-babel-speed-command-activate)
org-fold-core-isearch-open-function 'org-fold--isearch-reveal
org-persist-before-write-hook '(org-element--cache-persist-before-write)
org-tab-first-hook '(org-babel-hide-result-toggle-maybe 
org-babel-header-arg-expand)
org-link-shell-confirm-function 'yes-or-no-p
org-babel-pre-tangle-hook '(save-buffer)
org-agenda-loop-over-headlines-in-active-region nil
org-agenda-start-on-weekday nil
org-occur-hook '(org-first-headline-recenter)
org-metadown-hook '(org-babel-pop-to-session-maybe)
outline-minor-mode-prefix "o"
org-link-parameters '(("attachment" :follow org-attach-follow :complete 
org-attach-complete-link)
("id" :follow org-id-open)
("eww" :follow org-eww-open :store org-eww-store-link)
("rmail" :follow org-rmail-open :store org-rmail-store-link)
("mhe" :follow org-mhe-open :store org-mhe-store-link)
("irc" :follow org-irc-visit :store org-irc-store-link :export
org-irc-export)
("info" :follow org-info-open :export org-info-export :store
org-info-store-link :insert-description org-info-description-as-command)
("gnus" :follow org-gnus-open :store org-gnus-store-link)
("docview" :follow org-docview-open :export org-docview-export :store
org-docview-store-link)
("bibtex" :follow org-bibtex-open :store org-bibtex-store-link)
("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete
org-bbdb-complete-link :store org-bbdb-store-link)
("w3m" :store org-w3m-store-link)
("doi" :follow org-link-doi-open :export org-link-doi-export) ("file+sys")
("file+emacs") ("shell" :follow org-link--open-shell)
("news" :follow
#[514 "\301\300\302Q\"\207" ["news" browse-url ":"] 6
"\n\n(fn URL ARG)"]
)
("mailto" :follow
#[514 "\301\300\302Q\"\207" ["mailto" browse-url ":"] 6
"\n\n(fn URL ARG)"]
)
("https" :follow
#[514 "\301\300\302Q\"\207" ["https" browse-url ":"] 6
"\n\n(fn URL ARG)"]
)
("http" :follow
#[514 "\301\300\302Q\"\207" ["http" browse-url ":"] 6
"\n\n(fn URL ARG)"]
)
("ftp" :follow
#[514 "\301\300\302Q\"\207" ["ftp" browse-url ":"] 6
"\n\n(fn URL ARG)"]
)
("help" :follow org-link--open-help :store org-link--store-help)
("file" :complete org-link-complete-file)
("elisp" :follow org-link--open-elisp))
org-metaup-hook '(org-babel-load-in-session-maybe)
org-agenda-include-diary t
org-fast-tag-selection-single-key 'expert
org-reverse-note-order t
)

-- 
Robbie Morrison
Address: Schillerstrasse 85, 10627 Berlin, Germany
Phone: +49.30.612-87617