Log out ghost sessions instead of displaying message

router.php

@@ -65,7 +65,7 @@ if (isset($_COOKIE[SESSION_COOKIE_NAME]))
 
 if (isset($_SESSION['id'])) {
 	if (!isset(query('select', 'users', ['id' => $_SESSION['id']], 'id')[0]))
-		output(403, _('This account doesn\'t exist anymore. Log out to end this ghost session.'));
+		logout();
 
 	// Decrypt display username
 	if (!isset($_COOKIE['display-username-decryption-key']))