Yes I have. I believe this might be a bug in the window-numbering package:
https://github.com/nschum/window-numbering.elwhich I am loading in my ~/.emacs. This error appears when I start "emacs --daemon" and then open a client with "emacsclient ~/.emacs" (~/.emacs could be any other file). It only happens once, when the first file is opened.
It does not happen when I just use "emacs ~/.emacs", for example.
The window-numbering package is fully functional, though, so I haven't spent any time on investigating the cause, yet.
Cheers