flight 7 crashes when resizing with Gparted

-I'm installing flight 7.
-I'm in the step to create partitions.
-I create delete and create my partitions then apply changes.
-I realized I did something wrong and click the 'back' button. Gparted initializes.
- I change the size of a partition and create a new one in the free space left. Then I click on 'apply' and the installer wizard crashed and I got the following message:

We're sorry; the installer crashed. Please file a bug report at https://launchpad.net/distros/ubuntu/+source/ubiquity/+filebug and a developer will attend to the problem as soon as possible. To help the developers understand what went wrong, include the following detail in your bug report:
Traceback (most recent call last);
File "/usr/bin/ubiquity",line 112, in ?
install (sys.argv[1])
File "/usr/bin/ubiquity",line 52, in install
ret=wizard.run()
File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 702, in process_step
self.gparted_to_mountpoints()
File "/usr/lib/python2.4/sit-packages/ubiquity/frontend/gtkui.py", line 778, in gparted_to_mountpoints
print > self.gparted_subp.stdin, "apply"
IOError: [Errno 32] Broken pipe

Then I started the installation wizard again and this time I decided to delete all the partitions and start with a clean disposition from the beginning and everything was fine.