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Customizer not working - Non-existent changeset


Pro Member

I just updated WordPress to version 5.5.1 and now the Customizer does not work properly anymore.
Instead of a preview of my page I get the following error message (see picture) :

"Non-existent changeset UUID."

Everything else works just fine. So I have no idea what went wrong or how I can fix it.


(I'm using OneLine with a child theme)


Pro Member
You are right. As always. :)

After the update under General Settings the WordPress address and the site address are different now (see picture). I have no idea how this happened.


But now I am quite uncertain how to proceed. Should I add the "www" to the WordPress address, or delete the one in front of the site address?

1.) How can I find out which one is the correct address? The URL with or without "www"?
2.) Can I damage my page if I change the wrong one?

Thanks for your help.
You guys are the best.