ArrayIndexOutOfBoundsException in TreePacksPanel

The TreePacksPanel panel raises an ArrayIndexOutOfBoundsException if any of its children is marked as hidden.

The following works:

<pack name="Inculder" id="includer" required="no">
<description>Including pack</description>
</pack>
<pack name="Inculded1" id="included1" parent="includer" required="no">
<description>Including pack</description>
</pack>
<pack name="Inculded2" id="included2" parent="includer" required="no">
<description>Including pack</description>
</pack>

The following gives the exception

<pack name="Inculder" id="includer" required="no">
<description>Including pack</description>
</pack>
<pack name="Inculded1" id="included1" parent="includer" required="no">
<description>Including pack</description>
</pack>
<pack name="Inculded2" id="included2" parent="includer" required="no" hidden="true">
<description>Including pack</description>
</pack>

The exception is :
java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at com.izforge.izpack.panels.PacksModel.getValueAt(PacksModel.java:437)
at com.izforge.izpack.panels.TreePacksPanel.updateModel(TreePacksPanel.java:588)
at com.izforge.izpack.panels.TreePacksPanel.updateModel(TreePacksPanel.java:593)
at com.izforge.izpack.panels.TreePacksPanel.fromModel(TreePacksPanel.java:526)
at com.izforge.izpack.panels.CheckBoxNodeRenderer.getTreeCellRendererComponent(TreePacksPanel.java:996)
at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:2717)
at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:475)
at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(VariableHeightLayoutCache.java:1342)
at javax.swing.tree.VariableHeightLayoutCache.updateNodeSizes(VariableHeightLayoutCache.java:900)
at javax.swing.tree.VariableHeightLayoutCache.invalidateSizes(VariableHeightLayoutCache.java:354)
at javax.swing.plaf.basic.BasicTreeUI.setCellRenderer(BasicTreeUI.java:372)
at javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(BasicTreeUI.java:3326)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
at java.awt.Component.firePropertyChange(Component.java:8128)
at javax.swing.JTree.setCellRenderer(JTree.java:749)
at com.izforge.izpack.panels.TreePacksPanel.createPacksTree(TreePacksPanel.java:473)
at com.izforge.izpack.panels.TreePacksPanel.createNormalLayout(TreePacksPanel.java:186)
at com.izforge.izpack.panels.TreePacksPanel.panelActivate(TreePacksPanel.java:861)
at com.izforge.izpack.installer.InstallerFrame.switchPanel(InstallerFrame.java:839)
at com.izforge.izpack.installer.InstallerFrame.navigateNext(InstallerFrame.java:1451)
at com.izforge.izpack.installer.InstallerFrame.navigateNext(InstallerFrame.java:1419)
at com.izforge.izpack.installer.InstallerFrame$NavigationHandler.actionPerformed(InstallerFrame.java:1561)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
...