[O] LaTeX export crashes

[Ken Williams]

Hi, the following document makes a LaTeX export (C-c C-e d) crash with "Args 
out of range: "", -1, 0".  After that,

------------------
#+TITLE: Test doc
#+AUTHOR: Ken Williams

Some stuff.

#+begin_src R
5+5
#+end_src
------------------

Is this a known problem?

If I either omit the R source block, or add a top-level outline element to the 
document, then the export succeeds.  For now as a workaround I guess I'll add a 
header.

Thanks,

 -Ken

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