Ticket #49934: 49934.patch

wp-admin/includes/class-wp-site-health.php

@@ -613 +613 @@
                                                         /* translators: 1: The currently active theme. 2: The active theme's parent theme. */
                                                         __( 'To enhance your site’s security, we recommend you remove any themes you’re not using. You should keep your current theme, %1$s, and %2$s, its parent theme.' ),
                                                         $active_theme->name,
-                                                        $active_theme->parent()->name
+                                                        ( $active_theme->parent_theme ) ? $active_theme->parent_theme : $active_theme->template
                                                 )
                                         );
                                 } else {
@@ -633 +633 @@
                                                         __( 'To enhance your site’s security, we recommend you remove any themes you’re not using. You should keep %1$s, the default WordPress theme, %2$s, your current theme, and %3$s, its parent theme.' ),
                                                         $default_theme ? $default_theme->name : WP_DEFAULT_THEME,
                                                         $active_theme->name,
-                                                        $active_theme->parent()->name
+                                                        ( $active_theme->parent_theme ) ? $active_theme->parent_theme : $active_theme->template
                                                 )
                                         );
                                 }