crash in qt-examples Graphics View, Pad Navigator when closing demo application

abrt 1.0.8 detected a crash.

architecture: x86_64
Attached file: backtrace
cmdline: /usr/lib64/qt4/examples/graphicsview/padnavigator/padnavigator
comment: Crashes every time on my system when Closed.
component: qt
executable: /usr/lib64/qt4/examples/graphicsview/padnavigator/padnavigator
kernel: 2.6.31.5-127.fc12.x86_64
package: qt-examples-1:4.6.2-8.fc12
rating: 4
reason: Process /usr/lib64/qt4/examples/graphicsview/padnavigator/padnavigator
was killed by signal 11 (SIGSEGV)
release: Fedora release 12 (Constantine)

Backtrace attached as ^bug580750.txt

How to reproduce

1. Open qtdemo-qt4
2. Run the Graphics View > Pad Navigator example
3. Use arrow keys to navigate left, right, up, down, hit enter to open settings
4. Click window Close button