Customer portal internal error

I just upgraded to the latest version in order to check this new functionality but I get an Internal error message. See below

I also get this Internal Error after clicking on the link.
Cloud version.

Me too - with Windows 10 Desktop version

But maybe the Desktop version doesn’t support this as it would not have external access

I moved these messages to a new topic and put it into bugs. The error occurs on desktop or cloud edition when viewing a customer and clicking Link.

can not duplicate the problem on my machine.
Microsoft Windows 10 Professional (x64) Build 19041.985
clicking on the link in customers view opens a new tab in
standard browser ( pale moon 29.2.0 64-bit )
seems to work as it is supposed to

@Tut same in server version

Fixed in the latest version (21.6.1)