--- a/wp/wp-includes/class-smtp.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-includes/class-smtp.php	Wed Sep 21 18:19:35 2022 +0200
@@ -10,6 +10,6 @@
 	__( 'The SMTP class has been moved to the wp-includes/PHPMailer subdirectory and now uses the PHPMailer\PHPMailer namespace.' )
 );
 
-require __DIR__ . '/PHPMailer/SMTP.php';
+require_once __DIR__ . '/PHPMailer/SMTP.php';
 
 class_alias( PHPMailer\PHPMailer\SMTP::class, 'SMTP' );