warning thrown on search result page

Hi, I get the following warning on a search results page:

Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated wordpress/wp-includes/kses.php?on line?1805

To locate the error source I switched off all plugins with no effect. then I changed the theme to twenty twenty four and the errors is gone. Going back to Astra brings the error back. So please can u fix this. Thanks!!