Thank you for taking care. I switched back to PHP 7.4 but it did not make a difference. Order ends (after appr 60 seconds) in request timeout.
Two new entries in error log:
[14-Feb-2023 14:18:39 Europe/Berlin] PHP Notice: Trying to access array offset on value of type bool in /home/lichterh/public_html/prestashop/modules/pkelements/classes/WidgetPkproductViewed.php on line 155
[14-Feb-2023 14:30:43 Europe/Berlin] PHP Notice: Trying to access array offset on value of type bool in /home/lichterh/public_html/prestashop/modules/pkelements/classes/WidgetPkproductViewed.php on line 155
Debug mode doesn't help. If I click order in debug mode there is no error screen with details. After clicking 'order' the spinner goes on and on and on - because I switched off timeout by htaccess. But the order is not being finalized. I the satus line it says waiting for paypal.com - although I chose bank transfer payment.
Do you think it can be helpful if I upgrade from 1.7.8.7 to 1.7.8.8?