Multisite Customizer.php throws fatal Error “Expected single stylesheet key”

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`Got error ‘PHP message: PHP Fatal error: Uncaught Exception: Expected single stylesheet key. in /var/www/site.com/wp-includes/customize/class-wp-customize-custom-css-setting.php:71\nStack trace:\n#0 /var/www/site.com/wp-includes/class-wp-customize-manager.php(5725)`
This is a multisite with many sites in it.
When I try to access customiser i get this error.
I have tried disabling all plugins but still no bueno.

Any ideas how to fix?

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1 Comment
  1. I believe [this]) will explain your problem. Try downgrading your PHP or figuring out what is causing the conflict (probably a theme that is not PHP 8.x compliant).

 

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