Error 500 on homepage when logged

I get an error 500
after logging, even with an empty or default template
MODX Revolution 2.8.2-pl
Login 1.9.7 and 1.9.9
PHP 7.2

Other pages works fine…

After having disabled some plugins I found it works again when SEO Suite extra plugin is inactive.

Any idea ?

Somewhere on your server there should be a PHP error log. (NOT the error log in the MODx manager!)
Please check this file to see what the actual error message was.