Weird null point with win2000 & Jtable

Hi,
I have an application which uses a jtable, which has its own treeCellRenderer.
This application has 2 seperate trees which use the same renderer, 1 tree is always showing, and the other is displayed only at certain times.
Now everything works fine on my machine (win XP), when displaying the 2nd tree....but I tried it on a win2000 machine, and i got a nukk pointer exception.
the null pointer was here:
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
Map iconMap = (Map) icons.get(userObject.getClass()); //null pointer here
so i am assuming the getUserObject() is returning a null pointer....but i have no idea why...
anyone have any clues?
thansk!

any help on this.. anybody. ?

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