"call to a member funktion addstylesheet() on null" after paypal-payment

-- HikaShop version -- : 4.7.5
-- Joomla version -- : 4.3.4
-- PHP version -- : 8.1
-- Browser(s) name and version -- : Edge
-- Error-message(debug-mod must be tuned on) -- : call to a member funktion addstylesheet() on null

Hello

I configured the new plugin PayPal (in sandbox mode for now).

For payment by card, no problem.
But for settlement by PayPal account, I have a blank popup opening (saying "about:blank#blocked"). If I close this popup, then I have the expected window to PayPal.

Do you have any idea where this blank pop-up of content comes from?

Thanks in advance for your help.

Martin

Hi Nicolas,

thanks for the tip with the settings of the http headers: it worked!

The error "call to a member function addstylesheet() on null" still exists. Attached are the screenshots as requested. Maybe it's because of jevents?

Many thanks
Martin