importing GriffithXML fails: posters are not added

Importing Data with the Plugin "GriffithXML" fails. No Posters are added.

Griffith Version: 0.13 (svn Revision 1626)

./griffith --show-dep
gtk :: 2.24.0
gtk.glade :: 2.24.0
sqlalchemy :: 0.7.4
sqlite3 :: 2.6.0 (sqlite-lib 3.7.9)
reportlab :: 2.5
PIL :: True
psycopg2 :: 2.4.5 (dt dec mx pq3 ext)
MySQLdb :: 1.2.3.final.0
chardet :: 2.0.1
sqlite :: 1.0.1
lxml :: True

Debug Log:

E: Griffith(__init__:250): movie details are not unique, skipping
Traceback (most recent call last):
  File "/home/user/griffith/svn/lib/plugins/imp/__init__.py", line 248, in run
    edit.update_image(self.parent, number, poster)
  File "/home/user/griffith/svn/lib/edit.py", line 49, in update_image
    return update_image_from_memory(self, number, imagedata)
  File "/home/user/griffith/svn/lib/edit.py", line 82, in update_image_from_memory
    movie = session.query(db.Movie).filter_by(number=number).one()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2020, in one
    raise orm_exc.NoResultFound("No row was found for one()")
NoResultFound: No row was found for one()

Possible Solution:

I think the Query in line 82 from File lib/edit.py returns no row because previous Session operations are not commited.
My Solution is to add the following code before the Query:

session.commit()

After the Change Import works fine.