java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at undefined.GroupableTableHeaderUI.getHeaderHeight(GroupableTableHeaderUI.java:87)
at undefined.GroupableTableHeaderUI.createHeaderSize(GroupableTableHeaderUI.java:108)
at undefined.GroupableTableHeaderUI.getPreferredSize(GroupableTableHeaderUI.java:118)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1272)
at javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:75)
at java.awt.Container.preferredSize(Container.java:1175)
at java.awt.Container.getPreferredSize(Container.java:1159)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1274)
at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:702)
at java.awt.Container.layout(Container.java:1017)
at java.awt.Container.doLayout(Container.java:1007)
at java.awt.Container.validateTree(Container.java:1089)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validateTree(Container.java:1096)
at java.awt.Container.validate(Container.java:1064)
at java.awt.Window.show(Window.java:450)
at java.awt.Component.show(Component.java:1134)
at java.awt.Component.setVisible(Component.java:1089)
at undefined.GroupableHeaderExample.main(GroupableHeaderExample.java:66)

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