Hello Ihor

Many thanks for your follow up.

I have set `org-element-use-cache' to nil as you suggest. Seems fine.

My org-mode is just via the package management system on Ubuntu, so 
somewhat behind I guess.

Am a big fan of org-mode. Tx!

Robbie

On 15/09/2024 14.20, Ihor Radchenko wrote:
> Robbie Morrison<robbie.morrison@posteo.de> writes:
>
>> 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.
> Thanks for reporting!
>
> I note that you are using Org 9.6.15, while the latest Org version is
> Org 9.7.11. You may try to upgrade. It may fix the problems you are
> seeing.
>
> If not, please let us know.
>
> If you cannot upgrade, such warnings might be due to recently enabled
> parser cache - some bugs have been fixed in that area after Org
> 9.6.15. You can disable the cache by setting `org-element-use-cache' to
> nil.
>
> Hope it helps.
>
-- 
Robbie Morrison
Address: Schillerstrasse 85, 10627 Berlin, Germany
Phone: +49.30.612-87617