java.lang.NullPointerException
   at java.awt.Component$NativeInLightFixer.removeReferences(Component.java:0)
   at java.awt.Component$NativeInLightFixer.componentRemoved(Component.java:0)
   at java.awt.Container.processContainerEvent(Container.java:0)
   at java.awt.Container.processEvent(Container.java:0)
   at java.awt.Component.dispatchEventImpl(Component.java:0)
   at java.awt.Container.dispatchEventImpl(Container.java:0)
   at java.awt.Component.dispatchEvent(Component.java:0)
   at java.awt.Container.remove(Container.java:0)
   at javax.swing.JLayeredPane.remove(JLayeredPane.java:0)
   at java.awt.Container.remove(Container.java:0)
   at javax.swing.PopupFactory$ContainerPopup.hide(PopupFactory.java:0)
   at javax.swing.PopupFactory$MediumWeightPopup.hide(PopupFactory.java:0)
   at javax.swing.ToolTipManager.hideTipWindow(ToolTipManager.java:0)
   at javax.swing.ToolTipManager.mouseExited(ToolTipManager.java:0)
   at java.awt.AWTEventMulticaster.mouseExited(AWTEventMulticaster.java:0)
   at java.awt.Component.processMouseEvent(Component.java:0)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:0)
   at java.awt.Component.processEvent(Component.java:0)
   at java.awt.Container.processEvent(Container.java:0)
   at java.awt.Component.dispatchEventImpl(Component.java:0)
   at java.awt.Container.dispatchEventImpl(Container.java:0)
   at java.awt.Component.dispatchEvent(Component.java:0)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:0)
   at java.awt.LightweightDispatcher.trackMouseEnterExit(LightweightDispatcher.java:0)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:0)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:0)
   at java.awt.Container.dispatchEventImpl(Container.java:0)
   at java.awt.Window.dispatchEventImpl(Window.java:0)
   at java.awt.Component.dispatchEvent(Component.java:0)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:0)
   at java.awt.EventQueue.access$000(EventQueue.java:0)
   at java.awt.EventQueue$1.run(EventQueue.java:0)
   at java.awt.EventQueue$1.run(EventQueue.java:0)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:0)
   at java.awt.EventQueue$2.run(EventQueue.java:0)
   at java.awt.EventQueue$2.run(EventQueue.java:0)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:0)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:0)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:0)