Contact form isn´t working when user is not logged in

I have just realized that the contact form isn´t working when a user isn´t logged into the forum - argh.
The page returns HTTP ERROR 500.
The form does work when a user is logged in.
captcha_email on/off makes no difference.
I have looked through contact.inc.php but can´t figure out what is wrong.
Forum is version 20220803.1. PHP version is 8.0.
Any help is appreciated.

/Tommy

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Contact form isn´t working when user is not logged in - Tommy Nilsson, 2023-03-13, 10:13
- Contact form isn´t working when user is not logged in - Auge, 2023-03-13, 15:19
  - Contact form isn´t working when user is not logged in - Micha, 2023-03-13, 16:57
    - Contact form isn´t working when user is not logged in - Auge, 2023-03-13, 20:06
      - Contact form isn´t working when user is not logged in - Micha, 2023-03-13, 20:25
- Contact form isn´t working when user is not logged in - Tommy Nilsson, 2023-03-14, 09:27
  - Contact form isn´t working when user is not logged in - Auge, 2023-03-14, 19:55
  - Contact form isn´t working when user is not logged in - Auge, 2023-03-14, 21:21
  - Contact form isn´t working when user is not logged in - Auge, 2023-08-13, 20:26

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Contact form isn´t working when user is not logged in (General)