Babel/R issue: 'x' must be atomic

[Karl Voit <devnull@Karl-Voit.at>]

Hi!

Generating two separate boxplots for a given set of data is no problem. But
when I combine them into one single diagram (with two boxplots), I get:

Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) : 
  'x' must be atomic
Calls: <Anonymous> ... boxplot.stats -> <Anonymous> -> sort -> sort.default -> sort.int
Execution halted


You can get the minimal example Org-mode on http://paste.grml.org/1036/

When I replace the line 
            boxplot(list(folders, tags),
with 
            boxplot(list(mfolders, mtags),
it works, though :-O

mfolders and mtags are lists in R and not imported via »:var«. Therefore I
guess this is an Org-mode/babel issue and not an R issue. What is my error?

Any help would be very cool!


PS: Org-mode version from git from yesterday

-- 
Karl Voit