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)
```