So I first had issues with the checkout, there was a 500 server error thrown:
[Wed Nov 03 18:14:52.942411 2021] [php7:error] [pid 238973] [client xx] PHP Fatal error: Access level to SaferpayCw_LayoutController::$page_name must be public (as in class ModuleFrontController) in /var/www/html/myshop/modules/saferpaycw/lib/SaferpayCw/LayoutController.php on line 30, referer: https://myshop
Then I tried to revert back to version 1.7.7, which failed, and now the shop is down for good:
[Wed Nov 03 18:27:07.941129 2021] [php7:error] [pid 238993] [client xx] PHP Fatal error: Uncaught Error: Call to a member function getName() on null in /var/www/html/myshop/config/config.inc.php:122\nStack trace:\n#0 /var/www/html/myshop/admin/index.php(40): require()\n#1 {main}\n thrown in /var/www/html/myshop/config/config.inc.php on line 122, referer: https://myshop/admin/index.php?controller=AdminSelfUpgrade&token=3d0219119f80e7987c95775c8e94458a
[Wed Nov 03 22:28:54.598932 2021] [php7:warn] [pid 238973] [client xx] PHP Warning: Invalid argument supplied for foreach() in /var/www/html/myshop/classes/shop/Shop.php on line 346
What are your ideas? How to revert back manually?