Shop Error after PHP update to PHP Version 8.0

Shop Error after PHP update to PHP Version 8.0

After automatic update of server PHP Version to PHP 8.0 by our service provider the following Warning apears in Site frontend:
Warning: Undefined variable $orderby in /var/www/xxxxxxxxx/html/CoS-AKTIV/components/com_jshopping/tables/category.php on line 28
and Article deatails couln't be opened (0 - Unsupported operand types: jshopProduct * float).
Returned manually to PHP 7.4 solves the problem but the PHP Version 7.4 will disabled by our provider latest Nov.2022. Soulution needed

Any Ideas whats the problem could be?

Current Joomla Version 3.10.5 , Joomshopping Version 4.18.7

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Aw: Shop Error after PHP update to PHP Version 8.0

1. components\com_jshopping\tables\category.php

function getSubCategories....

change to

function getSubCategories($parentId, $order = 'id', $ordering = 'asc', $publish = 0){
$lang = JSFactory::getLang();
$user = JFactory::getUser();
$add_where = ($publish)?(" AND category_publish = '1' "):("");
$groups = implode(',', $user->getAuthorisedViewLevels());
$add_where .=' AND access IN ('.$groups.')';
$orderby = "ordering";
if ($order=="id") $orderby = "category_id";
if ($order=="name") $orderby = "`".$lang->get('name')."`";
if ($order=="ordering") $orderby = "ordering";

$query = "SELECT `".$lang->get('name')."` as name,`".$lang->get('description')."` as description,`".$lang->get('short_description')."` as short_description, category_id, category_publish, ordering, category_image FROM `#__jshopping_categories`
WHERE category_parent_id = '".$this->_db->escape($parentId)."' ".$add_where."
ORDER BY ".$orderby." ".$ordering;
$this->_db->setQuery($query);
$categories = $this->_db->loadObjectList();
foreach($categories as $key=>$value){
$categories[$key]->category_link = SEFLink('index.php?option=com_jshopping&controller=category&task=view&category_id='.$categories[$key]->category_id, 1);
}
return $categories;
}

Aw: Shop Error after PHP update to PHP Version 8.0

2. Article deatails couln't be opened (0 - Unsupported operand types: jshopProduct * float).

Need details error.

Global Configuration / tab system
Debug System: yes

Send me error.

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