Syntax error after trying to make a registration

-- HikaShop version -- : 4.6.0
-- Joomla version -- : 4.1.3.
-- PHP version -- : 8.0
-- Browser(s) name and version -- : Google Chrome
-- Error-message(debug-mod must be tuned on) -- : 0 syntax error, unexpected token "", expecting end of file

When a customer fills in the registration form and wants to save this, he gets a syntax error.
This makes that a purchase is not possible. How can I solve this?

I notice now that I don't have that problem with the guest checkout.
But I still like to solve this out.

Hi,

Please activate the "debug system" setting of the Joomla configuration and try again.
It should display an error message with more information on where the problem is. That will allow us to tell you what to do.

I hope this is clear enough, apparently the view is too small to schow it all.

Hi,

This error comes from a wrong customization of the "HTML" section of the email "user account" you did via the menu System>Emails.
Please check there. There is a problem on line 10.