Frontend Error 500, when logged in into Administration

Hello football and AnWP friends,

I am experiencing a problem with an Error 500 in my frontend, when I am logged in to the administration. The frontend works well, if I am logged out. The administration always works well. 

The error occurs from one moment to the other, without any changings serverside.

I would be happy for any suggestions

Greets, Uwe (tunesienfussball.de)

Here are my system informations:

• Plugin Version: AnWP Football Leagues 0.16.13
• WordPress version: 6.7.2
• Server Time: UTC
• WP Time: Africa/Tunis
• Current Date: 2025-03-04
• Site Locale: de_DE
• Plugin DB version: 42
• Statistic records: (matches/stats - 899/899)
• PHP version: 8.3.17
• Aktive Plugins:
  --- advanced-ads-adsense-in-feed
  --- advanced-ads
  --- analytics-insights
  --- classic-editor
  --- cmb2
  --- dsgvo-all-in-one-for-wp-pro
  --- duplicate-post
  --- duplicator
  --- football-leagues-by-anwppro
  --- tinymce-advanced
  --- w3-total-cache
  --- wordpress-seo
  --- wps-hide-login