Nullpointer Exception with simpleUML in IDEA 5.0

Afer installing simpleUML Plugin I will get the bellow NullPointer Exception when using IDE Settings - Customization Dialog. The Dialog won't open because of this Exception.

Error during dispatching of java.awt.event.MouseEvent[MOUSE_RELEASED,(85,489),button=1,modifiers=Button1,clickCount=1] on dialog38
java.lang.NullPointerException
at net.trustx.simpleuml.plugin.actions.ViewUMLWindowAction.getChildren(ViewUMLWindowAction.java:49)
at com.intellij.openapi.keymap.impl.ui.ActionsTreeUtil.createGroup(ActionsTreeUtil.java:6)
at com.intellij.openapi.keymap.impl.ui.ActionsTreeUtil.createGroup(ActionsTreeUtil.java:189)
at com.intellij.openapi.keymap.impl.ui.ActionsTreeUtil.createGroup(ActionsTreeUtil.java:207)
at com.intellij.openapi.keymap.impl.ui.ActionsTreeUtil.createGroup(ActionsTreeUtil.java:189)
at com.intellij.openapi.keymap.impl.ui.ActionsTreeUtil.createGroup(ActionsTreeUtil.java:207)
at com.intellij.ide.ui.customization.CustomActionsSchema.fillActionGroups(CustomActionsSchema.java:53)
at com.intellij.ide.ui.customization.CustomizableActionsPanel.a(CustomizableActionsPanel.java:119)
at com.intellij.ide.ui.customization.CustomizableActionsPanel.access$1600(CustomizableActionsPanel.java:238)
at com.intellij.ide.ui.customization.CustomizableActionsPanel$13.valueChanged(CustomizableActionsPanel.java:1)
at javax.swing.JList.fireSelectionValueChanged(JList.java:1317)
at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1331)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:408)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:417)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:441)
at javax.swing.JList.setSelectedIndex(JList.java:1732)
at javax.swing.JList.setSelectedValue(JList.java:1834)
at com.intellij.ide.ui.customization.CustomizableActionsPanel.c(CustomizableActionsPanel.java:142)
at com.intellij.ide.ui.customization.CustomizableActionsPanel.reset(CustomizableActionsPanel.java:45)
at com.intellij.ide.ui.customization.CustomizationConfigurable.reset(CustomizationConfigurable.java:4)
at com.intellij.openapi.options.ex.SingleConfigurableEditor.]]>(SingleConfigurableEditor.java:7)
at com.intellij.openapi.options.ex.ControlPanelSettingsEditor.b(ControlPanelSettingsEditor.java:28)
at com.intellij.openapi.options.ex.ControlPanelSettingsEditor.access$900(ControlPanelSettingsEditor.java:6)
at com.intellij.openapi.options.ex.ControlPanelSettingsEditor$MyActionButton$1.mouseReleased(ControlPanelSettingsEditor.java:6)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:65)
at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:107)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:160)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
at java.awt.Dialog$1.run(Dialog.java:515)
at java.awt.Dialog.show(Dialog.java:536)
at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:48)
at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:56)
at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:722)
at com.intellij.ide.actions.ShowSettingsUtilImpl.showControlPanelOptions(ShowSettingsUtilImpl.java:26)
at com.intellij.ide.actions.ShowSettingsUtilImpl.showSettingsDialog(ShowSettingsUtilImpl.java:40)
at com.intellij.ide.actions.ShowSettingsAction.actionPerformed(ShowSettingsAction.java:5)
at com.intellij.openapi.actionSystem.impl.ActionButton.performAction(ActionButton.java:27)
at com.intellij.openapi.actionSystem.impl.ActionButton.processMouseEvent(ActionButton.java:33)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:65)
at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:107)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:160)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

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