Call to a member function getType() on null after making a payment via PayPal

-- HikaShop version -- : 6.5.1.
-- Joomla version -- : 6.1.2.
-- PHP version -- : 8.4.16
-- Browser(s) name and version -- : chrome 150.0.7871.114
-- Error-message(debug-mod must be tuned on) -- : "Call to a member function getType() on null" after making a payment via PayPal

hikashop is on version 6.5.0 and generated the error "Call to a member function getType() on null" after making a payment via PayPal. I tried installing version 6.5.1, but the error persists. My Joomla version is 6.1.2.