Attempt to assign property "email" on null

Hello, I have upgraded to CB 2.8 and I have this error when a user tries to register:

0 Attempt to assign property "email" on null

Can you help me? Thank you.

Joomla 4.3.2
CB 2.8.0+build.2023.05.26.14.42.43.3634ccdb3
AcyMailing CB integration 1.2.0
AcyMailing Enterprise 8.4.6
PHP 8.0

Please turn site debug to on, so that you see where the error happens (PHP file and line number), as well as call stack, and maybe you also have some hidden notices and warnings before this error.

Since when or after what did you start to have this issue ?
Did you migrate the site from Joomla 3 ?
Or had 3rd party or old plugins that you removed without uninstalling ?
Are your extensions, incl. AcyMailing and AcyMailing CB integration up to date ?

Maybe this similar issue in this thread, also with AcyMailing, can also give you a hint on the solution:
www.joomlapolis.com/forum/professional-members-support/245520-cannot-edit-user-from-backend?start=12#332779

Thanks for your help.

I activated the debug with the maximum options and saw that the error seems to come with the Acymailing CB integration plugin, despite everything being updated with the latest versions.

So I'll contact them.

Greetings.