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

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java.lang.NullPointerException:
at org.netbeans.api.visual.model.ObjectScene.setHoveredObject(ObjectScene.java:298)
at org.netbeans.api.visual.model.ObjectScene$ObjectHoverProvider.widgetHovered(ObjectScene.java:557)
at org.netbeans.modules.visual.action.MouseHoverAction.mouseExited(MouseHoverAction.java:76)
at org.netbeans.api.visual.action.WidgetAction$Chain.mouseExited(WidgetAction.java:831)
at org.netbeans.api.visual.widget.SceneComponent$Operator$5.operate(SceneComponent.java:577)
at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:336)
at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:291)
at org.netbeans.api.visual.widget.SceneComponent.mouseExited(SceneComponent.java:175)
at java.awt.Component.processMouseEvent(Component.java:6539)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.retargetMouseEnterExit(Container.java:4668)
at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:4654)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4505)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)

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