Error when creation of category

-- HikaShop version -- : 4.6.0
-- Joomla version -- : 4.1.4
-- PHP version -- : 8.0.18
-- Browser(s) name and version -- : Chrome 99.0.4844.51 (Officiële build) (64-bits)
-- Error-message(debug-mod must be tuned on) -- : 0 Attempt to assign property "old" on null
Call stack
# Function Location
1 () JROOT/administrator/components/com_hikashop/classes/category.php:184
2 hikashopCategoryClass->save() JROOT/administrator/components/com_hikashop/classes/category.php:155
3 hikashopCategoryClass->saveForm() JROOT/administrator/components/com_hikashop/helpers/helper.php:2081
4 hikashopController->store() JROOT/administrator/components/com_hikashop/helpers/helper.php:2021
5 hikashopController->apply() JROOT/libraries/src/MVC/Controller/BaseController.php:735
6 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/administrator/components/com_hikashop/helpers/helper.php:2238
7 hikashopController->execute() JROOT/administrator/components/com_hikashop/hikashop.php:73
8 require_once() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:69
9 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71
10 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:389
11 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:143
12 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:186
13 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:278
14 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:63
15 require_once() JROOT/administrator/index.php:32

I haven't found this problem on the support yet, but might have overlooked it.

When trying to create a new category i get a error message.

0 Attempt to assign property "old" on null

Yes, this did the trick. Thank you for the quick solution.