1.6b wont let me exit on Redhat 7.0. I get the following stack trace:

java.lang.NullPointerException
at a.a.a.bx.k(bx.java:352)
at a.a.a.c.Initializer.c(Initializer.java:170)
at a.a.a.c.r.actionPerformed(r.java:153)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1450)
at javax.swing.AbstractButton$ForwardActionEvents.act ionPerformed(AbstractButton.java:1504)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:250)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:216)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:230)
at java.awt.Component.processMouseEvent(Component.jav a:3715)
at java.awt.Component.processEvent(Component.java:354 4)
at java.awt.Container.processEvent(Container.java:116 4)
at java.awt.Component.dispatchEventImpl(Component.jav a:2593)
at java.awt.Container.dispatchEventImpl(Container.jav a:1213)
at java.awt.Component.dispatchEvent(Component.java:24 97)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:2451)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:2216) at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:2125)
at java.awt.Container.dispatchEventImpl(Container.jav a:1200)
at java.awt.Window.dispatchEventImpl(Window.java:914)
at java.awt.Component.dispatchEvent(Component.java:24 97)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 339)
at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:98)
at java.awt.Dialog.show(Dialog.java:380)
at java.awt.Component.show(Component.java:946)
at java.awt.Component.setVisible(Component.java:903)
at a.a.a.c.o.a(o.java:118)
at a.a.a.c.MainFrame.shutdown(MainFrame.java:491)
at a.a.a.c.cj.actionPerformed(cj.java:151)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1450)
at javax.swing.AbstractButton$ForwardActionEvents.act ionPerformed(AbstractButton.java:1504)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:250)
at javax.swing.AbstractButton.doClick(AbstractButton. java:279)
at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputH andler.mouseReleased(BasicMenuItemUI.java:886)
at java.awt.Component.processMouseEvent(Component.jav a:3715)
at java.awt.Component.processEvent(Component.java:354 4)
at java.awt.Container.processEvent(Container.java:116 4)
at java.awt.Component.dispatchEventImpl(Component.jav a:2593)
at java.awt.Container.dispatchEventImpl(Container.jav a:1213)
at java.awt.Component.dispatchEvent(Component.java:24 97)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:2451)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:2216) at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:2125)
at java.awt.Container.dispatchEventImpl(Container.jav a:1200)
at java.awt.Window.dispatchEventImpl(Window.java:914)
at java.awt.Component.dispatchEvent(Component.java:24 97)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 339)
at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:98)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:85)