Fatal error TypeError: basename(): wp-settings.php in latest WP 6.8 Beta

[neo2k23]

I get a fatal error in the latest wp 6.8 beta nightly build

Fatal error: Uncaught TypeError: basename(): Argument #1 ($path) must be of type string, Theme given in /home/public_html/wp-settings.php:686 Stack trace: #0 /home/public_html/wp-settings.php(686): basename(Object(Theme)) #1 /home/wp-config.php(96): require_once('/home/...') #2 /home/public_html/wp-load.php(55): require_once('/home/..') #3 /home/public_html/wp-admin/admin.php(34): require_once('/home/...') #4 /home/public_html/wp-admin/about.php(10): require_once('/home/...') #5 {main} thrown in /home/public_html/wp-settings.php on line 686

cause by this code

Fatal error: Uncaught TypeError: basename(): Argument #1 ($path) must be of type string, Theme given in /home/public_html/wp-settings.php:686 Stack trace: #0

/home/public_html/wp-settings.php(686): basename(Object(Theme)) #1 /home/wp-config.php(96): require_once('/home/...') #2 /home/public_html/wp-load.php(55): require_once('/home/..') #3 /home/public_html/wp-admin/admin.php(34): require_once('/home/...') #4 /home/public_html/wp-admin/about.php(10): require_once('/home/...') #5 {main} thrown in /home/public_html/wp-settings.php on line 686

<?php
                // Load the functions for the active theme, for both parent and child theme if applicable.
                foreach ( wp_get_active_and_valid_themes() as $theme ) {
                        if ( file_exists( $theme . '/functions.php' ) ) {
                                include $theme . '/functions.php';
                        }

                        $theme = wp_get_theme( basename( $theme ) );
                        $theme->load_textdomain();
                }

[neo2k23]

suggested code change

<?php
foreach ( wp_get_active_and_valid_themes() as $theme ) {
        if ( file_exists( $theme . '/functions.php' ) ) {
                include $theme . '/functions.php';
        }
        
        if ( is_string( $theme ) ) {
                $theme = wp_get_theme( basename( $theme ) );
                $theme->load_textdomain();
        }
}

[swissspidy]

Thanks for your report. This was added in #62244, so let's fix that there.