Call to a member function getCart() on null when editing user information

-- HikaShop version -- : 4.2.2
-- Joomla version -- : 3.9.13
-- PHP version -- : 7.2.24
-- Browser(s) name and version -- : Google Chrome Version 78.0.3904.87 (Official Build) (64-bit)
-- Error-message(debug-mod must be tuned on) -- : Call to a member function getCart() on null
/mnt/data/vhosts/casite-584904.cloudaccess.net/httpdocs/administrator/components/com_hikashop/classes/address.php:246

Call stack
# Function Location
1 () JROOT/administrator/components/com_hikashop/classes/address.php:246
2 hikashopAddressClass->save() JROOT/administrator/components/com_hikashop/controllers/user.php:118
3 UserController->saveaddress() JROOT/libraries/src/MVC/Controller/BaseController.php:710
4 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/administrator/components/com_hikashop/helpers/helper.php:1976
5 hikashopController->execute() JROOT/administrator/components/com_hikashop/hikashop.php:72
6 require_once() JROOT/libraries/src/Component/ComponentHelper.php:402
7 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377
8 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:101
9 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:159
10 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:196
11 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/index.php:51

I haven't had to actually edit the customer information for awhile, so I'm not sure if this issue existed before I upgraded to the latest Hikashop version.

The 'Call to a member function getCart() on null' error appears when I click the OK button after editing the billing or shipping addresses after they are created.

I can create the billing/shipping address with no problems, but I cannot edit an existing one.

I set error reporting to maximum, and I pasted in the info that shows when I try to save an edit.

Thanks for any help.

Yes that worked perfectly, thanks!

I have the same problem as described in this ticket.
I changed the line as described:
$checkoutHelper = hikashop_get('class.checkout');
To:
$checkoutHelper = hikashop_get('helper.checkout');

There is no error anymore but the modification is not applied.