AssertionError when edit JDK

java.lang.AssertionError
 at org.openide.awt.HtmlRendererImpl.reset(HtmlRendererImpl.java:78)
 at org.openide.awt.HtmlRendererImpl.getTreeCellRendererComponent(HtmlRendererImpl.java:122)
 at org.openide.explorer.view.NodeRenderer.getTreeCellRendererComponent(NodeRenderer.java:131)
 at java.desktop/javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:3155)
 at java.desktop/javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:493)
 at java.desktop/javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(VariableHeightLayoutCache.java:1344)
 at java.desktop/javax.swing.tree.VariableHeightLayoutCache.updateNodeSizes(VariableHeightLayoutCache.java:903)
 at java.desktop/javax.swing.tree.VariableHeightLayoutCache.invalidateSizes(VariableHeightLayoutCache.java:371)
 at java.desktop/javax.swing.plaf.basic.BasicTreeUI.setCellRenderer(BasicTreeUI.java:465)
 at java.desktop/javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(BasicTreeUI.java:3816)
 at java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:266)
 at java.desktop/java.awt.Component.firePropertyChange(Component.java:8728)
 at java.desktop/javax.swing.JTree.setCellRenderer(JTree.java:775)
 at org.openide.explorer.view.TreeView.initializeTree(TreeView.java:281)
 at org.openide.explorer.view.TreeView.<init>(TreeView.java:213)
 at org.openide.explorer.view.TreeView.<init>(TreeView.java:203)
 at org.openide.explorer.view.BeanTreeView.<init>(BeanTreeView.java:73)
 at org.netbeans.modules.java.platform.ui.PlatformsCustomizer$PlatformsView.<init>(PlatformsCustomizer.java:527)
 at org.netbeans.modules.java.platform.ui.PlatformsCustomizer.initComponents(PlatformsCustomizer.java:153)
 at org.netbeans.modules.java.platform.ui.PlatformsCustomizer.<init>(PlatformsCustomizer.java:94)
 at org.netbeans.api.java.platform.PlatformsCustomizer.showCustomizer(PlatformsCustomizer.java:41)
 at org.netbeans.modules.java.api.common.project.ui.PlatformNode$PlatformEditable.edit(PlatformNode.java:292)
 at org.netbeans.modules.java.api.common.project.ui.EditRootAction.performAction(EditRootAction.java:41)
 at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:561)
 at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:70)
 at org.openide.util.actions.ActionInvoker$ActionRunnable.actionPerformed(ActionInvoker.java:137)
 at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:84)
 at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:35)
 at org.openide.util.actions.ActionInvoker$ActionRunnable.doRun(ActionInvoker.java:128)
 at org.openide.util.actions.ActionInvoker$2.run(ActionInvoker.java:85)
 at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
 at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
 at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
 at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to
 at org.openide.util.RequestProcessor.post(RequestProcessor.java:395)
 at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:89)
 at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:74)
 at org.openide.util.actions.NodeAction$DelegateAction.actionPerformed(NodeAction.java:558)
 at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
 at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
 at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
 at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
 at java.desktop/javax.swing.AbstractButton.doClick(AbstractButton.java:369)
 at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1020)
 at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1064)
 at java.desktop/java.awt.Component.processMouseEvent(Component.java:6632)
 at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
 at java.desktop/java.awt.Component.processEvent(Component.java:6397)
 at java.desktop/java.awt.Container.processEvent(Container.java:2263)
 at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008)
 at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
 at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
 at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
 at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
 at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
 at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
 at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
 at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
 at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
 at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
 at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
 at java.base/java.security.AccessController.doPrivileged(Native Method)
 at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
 at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
 at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
 at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
 at java.base/java.security.AccessController.doPrivileged(Native Method)
 at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
 at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
 at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
 at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
 at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
 at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
 at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
 at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
[catch] at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)