Hi,

If I have an org-mode buffer with these contents:

# Skips to here

#+begin_src R
library(tools) # eval-line-and-step issued here
library(MASS)
#+end_src

And I issue eval-line-and-step at the library(tools) line, ESS (13.05 at
least) will "skip" up to the first commented line ABOVE the current line,
instead of just going down to the next line.

This error is emitted in the mini-buffer: Wrong type argument: stringp, nil.

Thanks,
Michael

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