OC 4.0.2.3 customer view order history error

[Belleson]

What version of OpenCart are you reporting this for?
OC 4.0.2.3

Describe the bug
In catalog/model/account/order.php lines 81 and 97

‘payment_method’ => $order_query->row['payment_method'] ? json_decode($order_query->row['payment_method'], true) : '',

where json_decode returns null for non-JSON strings.

PHP Warning: Trying to access array offset on value of type null in public_html/oc/catalog/controller/account/order.php

What section does it affect?
Customer view order history from Account page
The error also exists for shipping_method

To Reproduce
Steps to reproduce the behavior:

1. Create an order with payment method that uses JSON, e.g. Square
2. After order is complete, go to My Account->Order History
3. Click View button
4. See Internal Server Error! There has been a problem loading the page you are looking for.

The same order shows successfully in Admin console with empty payment method field, no server error page

Expected behavior
View payment history

Screenshots / Screen recordings

Server environment (please complete the following information):

• Linux
• PHP version 8.1
  cPanel Version | 116.0 (build 11)
  Apache Version | 2.4.58
  MySQL Version | 8.0.36
  Architecture | x86_64
  Operating System | linux
  Shared IP Address | 45.79.178.199
  Path to Sendmail | /usr/sbin/sendmail
  Path to Perl | /usr/bin/perl
  Perl Version | 5.26.3
  Kernel Version | 4.18.0-477.21.1.lve.1.el8.x86_64

Additional context
I have no PHP experience, otherwise would post a PR