java.util.ConcurrentModificationException
   at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
   at java.util.HashMap$KeyIterator.next(HashMap.java:841)
   at org.netbeans.modules.options.keymap.KeymapModel.mergeActions(KeymapModel.java:325)
   at org.netbeans.modules.options.keymap.KeymapModel.getActions(KeymapModel.java:127)
   at org.netbeans.modules.options.keymap.KeymapModel.<init>(KeymapModel.java:457)
   at org.netbeans.modules.options.keymap.KeymapViewModel.<init>(KeymapViewModel.java:87)
   at org.netbeans.modules.options.keymap.KeymapPanel.getModel(KeymapPanel.java:239)
   at org.netbeans.modules.options.keymap.KeymapPanel.<init>(KeymapPanel.java:98)
   at org.netbeans.modules.options.keymap.KeymapPanelController.getKeymapPanel(KeymapPanelController.java:119)
   at org.netbeans.modules.options.keymap.KeymapPanelController.getComponent(KeymapPanelController.java:103)
   at org.netbeans.modules.options.CategoryModel$Category.getComponent(CategoryModel.java:420)
   at org.netbeans.modules.options.OptionsPanel.setCurrentCategory(OptionsPanel.java:181)
   at org.netbeans.modules.options.OptionsPanel.access$100(OptionsPanel.java:98)
   at org.netbeans.modules.options.OptionsPanel$CategoryButton.mouseReleased(OptionsPanel.java:528)
   at java.awt.Component.processMouseEvent(Component.java:6504)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6269)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4860)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4686)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4492)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2713)
   at java.awt.Component.dispatchEvent(Component.java:4686)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
   at java.awt.EventQueue.access$000(EventQueue.java:101)
   at java.awt.EventQueue$3.run(EventQueue.java:666)
   at java.awt.EventQueue$3.run(EventQueue.java:664)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:680)
   at java.awt.EventQueue$4.run(EventQueue.java:678)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)