[O] C-x n s no longer works in outline mode

[Leo]

I have been using this outside of org-mode for many years but it is
broken in 7.7.

Debugger entered--Lisp error: (error "Before first headline at position 134230 
in buffer init")
  signal(error ("Before first headline at position 134230 in buffer init"))
  error("Before first headline at position %d in buffer %s" 134230 #<buffer 
init>)
  byte-code("\300\301`p#\207" [error "Before first headline at position %d in 
buffer %s"] 4)
  org-back-to-heading(t)
  org-narrow-to-subtree()
  call-interactively(org-narrow-to-subtree nil nil)

Leo