emacs-version is "24.3.50.1" (yesterday's trunk) though this error was introduced in some earlier version.
emacs -Q --debug-init
M-: (window-state-get)
see the error:
```
Debugger entered--Lisp error: (error "Combination limit is meaningful for internal windows only")
window-combination-limit(#<window 0x11106b8 on *scratch*>)
window--state-get-1(#<window 0x11106b8 on *scratch*> nil)
window-state-get()
eval((window-state-get) nil)
eval-_expression_((window-state-get) nil)
call-interactively(eval-_expression_ nil nil)
command-execute(eval-_expression_)
```