PHP Notice issued if payment method disabled during checkout process

[lat9]

If a payment method is removed via the admin while a customer is in the middle of a checkout process, a couple of PHP notices are thrown:

[06-Oct-2019 12:55:53 America/New_York] Request URI: /zc156posm/index.php?main_page=checkout_one, IP address: ::1
#1  require(C:\xampp\htdocs\zc156posm\includes\modules\pages\checkout_one\header_php.php) called at [C:\xampp\htdocs\zc156posm\index.php:36]
--> PHP Notice: Undefined variable: xyz in C:\xampp\htdocs\zc156posm\includes\modules\pages\checkout_one\header_php.php on line 379.

[06-Oct-2019 12:55:53 America/New_York] Request URI: /zc156posm/index.php?main_page=checkout_one, IP address: ::1
#1  require(C:\xampp\htdocs\zc156posm\includes\modules\pages\checkout_one\header_php.php) called at [C:\xampp\htdocs\zc156posm\index.php:36]
--> PHP Notice: Undefined variable: xyz in C:\xampp\htdocs\zc156posm\includes\modules\pages\checkout_one\header_php.php on line 385.