Hello Jan,
Thank you for your mail. You can remove the post entirely.
(was unable to send a private message to you directly, did not know how, now I do,
so thank you for sending the link about slack)
I have left the homepage with the error,
did not continue working on development, for you to see That an error might occur.
It may have to do with I cloned a site using cPanel clone,
I know something also went wrong with the really-simple_SSL
The solution was to delete the SSL (and SSL-pro) plugins then re-install them.
Today I will delete the home-page, and continue testing the plugin,
looks really good, Thank you.
Love to hear from you.
Best regards,
Bastiaan