Ihor Radchenko <yantar92@posteo.net> writes:

> stardiviner <numbchild@gmail.com> writes:
>
>> When I org-capture from elfeed-entry buffer (I defined custom functions to
>> extract elfeed entry buffer content) in the second time and later, the
>> bellowing error raised up. The first-time capture is fine.
>>
>> Here is the error backtrace:
>> #+begin_example
>> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>>   expand-file-name(nil)
>>   userlock--check-content-unchanged("~/Org/Tasks/Tasks.org")
>
> This looks like some interaction between Org setting `buffer-file-name'
> to nil in *Capture* buffer and Emacs' file locking machinery. Maybe.
> Maybe Emacs bug. I have no better ideas.
>
> I also see nothing wrong we do on Org side.

First, Ihor, I need to thank you. With your hints. I try to figure out
what things might get involved between Org setting `buffer-file-name'
and *Capture* buffer.

1. I try to set `org-capture-mode-hook`, `org-mode-hook' etc to nil.

2. Use bug-hunter to bisect my emacs config, the first start, the
   problem does not occurred, this is weird, even I tried many times.

3. Then I use comment to bisect my init.el, try to figure out the
   reason. Still not found. And the problem not occurred.

4. I start Emacs again with original config. Now the problem gone. I
   restart Emacs many times, problem still not occurred. Weird.

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