Warning: Illegal offset type

I’ve got the same problem: https://wordpress.k21.webseiten.cc/presse/pressemitteilungen/
Any solution?

I never found a fix/solution so I just hid the on page errors as it doesn’t seem to affect functionality on my site.

hey Dr. What did you do to hide the error? I have tried everything I can think of and either I get no thumbs (does not work with my theme) or I get the offset issue!

thanks

Any fix to this? I’ve just updated and now I’m getting this warning as well. I’m working with a child 2010 theme.