java.lang.NullPointerException
   at javax.swing.text.FlowView$LogicalView.getPreferredSpan(FlowView.java:715)
   at javax.swing.text.FlowView.calculateMinorAxisRequirements(FlowView.java:216)
   at javax.swing.text.html.ParagraphView.calculateMinorAxisRequirements(ParagraphView.java:128)
   at javax.swing.text.BoxView.checkRequests(BoxView.java:918)
   at javax.swing.text.BoxView.getMinimumSpan(BoxView.java:551)
   at javax.swing.text.html.ParagraphView.getMinimumSpan(ParagraphView.java:261)
   at javax.swing.text.BoxView.calculateMinorAxisRequirements(BoxView.java:886)
   at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(BlockView.java:129)
   at javax.swing.text.BoxView.checkRequests(BoxView.java:918)
   at javax.swing.text.BoxView.getMinimumSpan(BoxView.java:551)
   at javax.swing.text.html.BlockView.getMinimumSpan(BlockView.java:361)
   at javax.swing.text.BoxView.calculateMinorAxisRequirements(BoxView.java:886)
   at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(BlockView.java:129)
   at javax.swing.text.BoxView.checkRequests(BoxView.java:918)
   at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:326)
   at javax.swing.text.BoxView.layout(BoxView.java:691)
   at javax.swing.text.BoxView.setSize(BoxView.java:380)
   at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1702)
   at javax.swing.plaf.basic.BasicTextUI.getPreferredSize(BasicTextUI.java:905)
   at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
   at javax.swing.JEditorPane.getPreferredSize(JEditorPane.java:1414)
   at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:769)
   at java.awt.Container.layout(Container.java:1421)
   at java.awt.Container.doLayout(Container.java:1410)
   at java.awt.Container.validateTree(Container.java:1507)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validateTree(Container.java:1513)
   at java.awt.Container.validate(Container.java:1480)
   at java.awt.Window.show(Window.java:860)
   at java.awt.Component.show(Component.java:1563)
   at java.awt.Component.setVisible(Component.java:1515)
   at java.awt.Window.setVisible(Window.java:841)
   at org.netbeans.modules.javahelp.JavaHelp.displayHelpInFrame(JavaHelp.java:352)
   at org.netbeans.modules.javahelp.JavaHelp.createAndDisplayJHelp(JavaHelp.java:514)
   at org.netbeans.modules.javahelp.JavaHelp.showHelp(JavaHelp.java:487)
   at org.netbeans.modules.javahelp.JavaHelp.display(JavaHelp.java:531)
   at org.openide.util.HelpCtx.display(HelpCtx.java:134)
   at org.netbeans.core.windows.services.NbPresenter.showHelp(NbPresenter.java:1522)
   at org.netbeans.core.windows.services.NbPresenter.access$500(NbPresenter.java:126)
   at org.netbeans.core.windows.services.NbPresenter$ButtonListener.actionPerformed(NbPresenter.java:1304)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
   at java.awt.Component.processMouseEvent(Component.java:6263)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6028)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2475)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)