[pstricks] psgraph pb with pstricks-add 3.39

[Antoine Pairet]

Hi all!
Since version 3.39 of PSTricks-add I am experiencing some troubles. The
following minimal example
\documentclass{article}
  \usepackage{pstricks-add}
  \listfiles
\begin{document}
  \begin{psgraph}{->}(5.2,-3)(5.2,-3)(5.8,0){9cm}{5cm}
  \end{psgraph}
\end{document}

gives me this error:
! Undefined control sequence.
\pst@@@vlabel ... \psk at ylogBase \@empty \psvlabel 
                                                  {\expandafter
\@LabelComma...
l.6 ...graph}{->}(5.2,-3)(5.2,-3)(5.8,0){9cm}{5cm}
                                                  
? 

Adding the option "labels=none" to psgraph environment suppresses the
error. My file list:
 *File List*
 article.cls    2005/09/16 v1.4f Standard LaTeX document class
  size10.clo    2005/09/16 v1.4f Standard LaTeX file (size option)
pstricks-add.sty    2010/02/11 v. 0.14 package wrapper for
pstricks-add.tex (hv
)
pstricks.sty    2010/03/20 v0.43 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex    2010/02/23 v2.02 `PSTricks' (tvz,hv)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
 xkeyval.sty    2008/08/13 v2.6a package option processing (HA)
 xkeyval.tex    2008/08/13 v2.6a key=value parser (HA)
  pst-fp.tex    2010/01/17 v0.05 `pst-fp' (hv)
  xcolor.sty    2007/01/21 v2.11 LaTeX color extensions (UK)
   color.cfg    2007/01/18 v1.5 color configuration of teTeX/TeXLive
   dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pstricks-add.tex    2010/03/12 v3.39 `PSTricks-add' (hv)
 ***********

Best regards,
Antoine