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This exception has no message.
java.lang.NullPointerException: 	at undefined.CustFrame.actionPerformed(CustFrame.java:170)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)	at javax.swing.AbstractButton.doClick(AbstractButton.java:279)	at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:886)	at java.awt.Component.processMouseEvent(Component.java:3717)	at java.awt.Component.processEvent(Component.java:3546)	at java.awt.Container.processEvent(Container.java:1167)	at java.awt.Component.dispatchEventImpl(Component.java:2595)	at java.awt.Container.dispatchEventImpl(Container.java:1216)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)	at java.awt.Container.dispatchEventImpl(Container.java:1203)	at java.awt.Window.dispatchEventImpl(Window.java:918)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)