Question Getting strange errors on Kunena

I have run the diagnostics and cleaned the database but still getting errors, is there a way to export the messages and do a clean install?
What would cause this all of the sudden It has been working fine.
.ErrorDuplicate entry '0' for key 'PRIMARY

'ErrorException throw at line 668 in file /home/basctx/public_html/libraries/joomla/database/driver/mysqli.php with message You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 'test')' at line 3

Now just got a new error

ErrorException throw at line 668 in file /home/basctx/public_html/libraries/joomla/database/driver/mysqli.php with message You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 'I have expired the memberships early to prep the new site for registrations.\r' at line 3

Is the joomla and kunena version and extensions and plug-ins completely up to date?.
And has something else been changed, eg a different PHP version has been set?

Updated to the latest Kunena and running Joomla 3.10, just changed the php to 8.0

was the problem not there with your previous php version ?

Yes it was there, I updated to PHP 8 thinking that would fix it.

You can try following:
Important! First create a backup of your database!
Then download and install the extension Admin Tools . You just have to select UTF-8 Multibyte under "Change Database Collation" (it is already preset) and run it. After that (as recommended) click on "Repair & Optimise Tables".