Got this fatal error:
Fatal error: Cannot access empty property in /DRUPAL7/profiles/wetkit/modules/contrib/ctools/plugins/export_ui/ctools_export_ui.class.php on line 1043

by just browsing here:
eng/admin/structure/file-types/manage/image/file-display

Not sure where this is a problem, but looks like ctools to me.

Comments

I get this error also. Did you ever figure it out?

Nope. @loze are you using https://github.com/wet-boew/wet-boew-drupal

Just trying to see if there are any similarities. This is basted on Panopoly.

No I'm not. I overlooked the profile in the path of your original post.
This error has gone away for me now. Not sure what it was in my case.
Sorry I can't be of more help.

NP. Might be something with initializing a variable that just happens the once..