Shotwell export results corrupted photos

Exporting photos with same name in different folders result in corrupted image files at the target place.
For example there are some different files in different folders but all of those are called as "image1.jpg". Exporting all "image1.jpg"-s from library results only one but corrupted "image1.jpg" in the target directory.
I think, in this case shotwell should rename files (for example indexing, such as image1(1).jpg, image1(2).jpg and so on) or should be enabled create directories at the target place.

szilva@szilva-Latitude-64:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

szilva@szilva-Latitude-64:~$ apt-cache policy shotwell
shotwell:
  Installed: 0.18.0-0ubuntu4.4
  Candidate: 0.18.0-0ubuntu4.4
  Version table:
 *** 0.18.0-0ubuntu4.4 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.18.0-0ubuntu4 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages