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The Options page of any Joomla extension is rendered by com_config, a core Joomla component. All we provide is an XML file without any executable code. Therefore the error you are receiving is coming from core Joomla code outside of our control.

FYI, you will see things like that happening with PHP 8. Unlike PHP 5 and 7, PHP 8 is far stricter when it comes to variable type compatibility. Joomla has a code base with a long history dating back to the early days of PHP 4 some 20 years ago. While people have tried to fix type consistency issues over the years, the extent of the code base and practical constraints make it impossible to do a full code review. Some issues will still be present and need to be fixed. Well, since you bumped on such a problem you and I can help solve it :)

Please go to your Global Configuration and set Error Reporting to Development and Debug Site to Yes. Trigger the same issue. You will be given a more detailed error message which includes two additional and very important things: the file and line this error occurred and the debug backtrace. Please take a screenshot of both and attach it to your next reply. I can try to see if there is a way to work around the core Joomla issue on our side or try to have it fixed in Joomla itself.