Openni_tracker crashes with a segmentation fault (core dumped). [closed]

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Any idea on what is causing it ? It is running on Ubuntu 12.04 LTS, ROS Fuerte and an intel graphics card.

gbd run output :

     (gdb) run
    Starting program: /opt/ros/fuerte/stacks/openni_tracker/bin/openni_tracker 
    [Thread debugging using libthread_db enabled]
    Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
    [New Thread 0x7ffff1038700 (LWP 8120)]
    [New Thread 0x7ffff0837700 (LWP 8121)]
    [New Thread 0x7fffebfff700 (LWP 8122)]
    [New Thread 0x7fffeb7fe700 (LWP 8127)]
    [New Thread 0x7fffdf623700 (LWP 8133)]

    Program received signal SIGSEGV, Segmentation fault.
    0x00007fffe8a56e56 in Segmentation::detectionByPoint(bool, std::vector<Vector2D<int>, std::allocator<Vector2D<int> > > const*) ()
       from /usr/lib/libXnVFeatures_1_5_2.so


BT output :
#0  0x00007fffe8a56e56 in Segmentation::detectionByPoint(bool, std::vector<Vector2D<int>, std::allocator<Vector2D<int> > > const*) ()
   from /usr/lib/libXnVFeatures_1_5_2.so
#1  0x00007fffe8a61b61 in Segmentation::update(Array2D<unsigned short> const&, MotionDetectorByEdges const&, Floor const&, Farfield&, std::vector<Vector2D<int>, std::allocator<Vector2D<int> > > const*) ()
   from /usr/lib/libXnVFeatures_1_5_2.so
#2  0x00007fffe8a4769b in SceneAnalyzer::Update(std::vector<Vector2D<int>, std::allocator<Vector2D<int> > > const*, unsigned int) ()
   from /usr/lib/libXnVFeatures_1_5_2.so
#3  0x00007fffe8a0f95e in XnVSceneAnalyzer::InitFromSM() ()
   from /usr/lib/libXnVFeatures_1_5_2.so
#4  0x00007fffe8a107cb in XnVSceneAnalyzer::UpdateData() ()
   from /usr/lib/libXnVFeatures_1_5_2.so
#5  0x00007ffff6d315b7 in ?? () from /usr/lib/libOpenNI.so.0
#6  0x00007ffff6d3173e in ?? () from /usr/lib/libOpenNI.so.0
#7  0x00007ffff6d316b3 in ?? () from /usr/lib/libOpenNI.so.0
#8  0x00007ffff6d31965 in ?? () from /usr/lib/libOpenNI.so.0
#9  0x00007ffff6d31c0a in xnWaitAndUpdateAll () from /usr/lib/libOpenNI.so.0
#10 0x000000000040346b in WaitAndUpdateAll (this=<optimized out>)
    at /usr/include/ni/XnCppWrapper.h:9347
#11 main (argc=1, argv=<optimized out>)
    at /tmp/buildd/ros-fuerte-openni-tracker-0.1.3/debian/ros-fuerte-openni-tracker/opt/ros/fuerte/stacks/openni_tracker/src/openni_tracker.cpp:190

It also usually happens after I run it once succesfully. The first time it always runs OK, after that it may work once more, but the next will always segfault. After a reboot the same procedure occurs.