java.lang.NullPointerException
        at org.netbeans.modules.javahelp.JavaHelp.displayHelpInFrame(JavaHelp.java:197)
        at org.netbeans.modules.javahelp.JavaHelp.showHelp(JavaHelp.java:343)
        at org.netbeans.modules.javahelp.HelpCtxProcessor$ShortcutPresenter.actionPerformed(HelpCtxProcessor.java:197)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1109)
        at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)
        at java.awt.Component.processMouseEvent(Component.java:5103)
        at java.awt.Component.processEvent(Component.java:4900)
        at java.awt.Container.processEvent(Container.java:1569)
        at java.awt.Component.dispatchEventImpl(Component.java:3618)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Component.dispatchEvent(Component.java:3480)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3480)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3195)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3125)
        at java.awt.Container.dispatchEventImpl(Container.java:1613)
        at java.awt.Window.dispatchEventImpl(Window.java:1599)
        at java.awt.Component.dispatchEvent(Component.java:3480)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:451)
[catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)