Please help us help you and fill where relevant:
Your LimeSurvey version: Version 5.2.11+220124
Own server or LimeSurvey hosting: own server
Theme: Any
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Maybe someone can help, please:

When trying to use "Configuration --> Themes" we receive a "500: Internal Server Error Object of class stdClass could not be converted to string". This error occurs under php8.0, while unter php 74, 7.3 and 72 we get a somewhat broke (obviously no css) themes overview page that is however functional. Once clicking on "edit" all works fine with the normal (unbroken) look and feel ... so it is only the "https://....com/index.php/surveyAdministration/listsurveys

Any ideas?

Thanks

Thorsten 

Best seems to report the issue (if you can update to 5.2.13 it's better).
community.limesurvey.org/bug-tracker/

Please put the link of report here

I just updated to but no change. Report is here:

bugs.limesurvey.org/view.php?id=17876