java.lang.NullPointerException
        at org.netbeans.modules.form.layoutdesign.LayoutDesigner.isUnplacedComponent(LayoutDesigner.java:411)
        at org.netbeans.modules.form.FormDesigner.updateAssistantContext(FormDesigner.java:1080)
        at org.netbeans.modules.form.FormDesigner.selectionChanged(FormDesigner.java:1008)
        at org.netbeans.modules.form.FormDesigner.addComponentToSelectionImpl(FormDesigner.java:971)
        at org.netbeans.modules.form.ComponentInspector$NodeSelectionListener.propertyChange(ComponentInspector.java:521)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.openide.explorer.ExplorerManager$2.run(ExplorerManager.java:842)
        at org.openide.util.Mutex.doEvent(Mutex.java:1335)
        at org.openide.util.Mutex.readAccess(Mutex.java:345)
        at org.openide.explorer.ExplorerManager.fireInAWT(ExplorerManager.java:839)
        at org.openide.explorer.ExplorerManager$1AtomicSetSelectedNodes.fire(ExplorerManager.java:260)
        at org.openide.explorer.ExplorerManager.setSelectedNodes(ExplorerManager.java:273)
        at org.openide.explorer.ExplorerManager$1SetExploredContextAndSelection.run(ExplorerManager.java:361)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.explorer.ExplorerManager.setExploredContextAndSelection(ExplorerManager.java:388)
        at org.openide.explorer.view.BeanTreeView.selectionChanged(BeanTreeView.java:155)
        at org.openide.explorer.view.TreeView.callSelectionChanged(TreeView.java:752)
        at org.openide.explorer.view.TreeView$TreePropertyListener.run(TreeView.java:1320)
        at org.openide.util.Mutex.postRequest(Mutex.java:1251)
        at org.openide.util.Mutex.postReadRequest(Mutex.java:565)
        at org.openide.explorer.view.TreeView$TreePropertyListener.valueChanged(TreeView.java:1291)
        at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
        at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1078)
        at javax.swing.tree.DefaultTreeSelectionModel.addSelectionPaths(DefaultTreeSelectionModel.java:406)
        at javax.swing.tree.DefaultTreeSelectionModel.addSelectionPath(DefaultTreeSelectionModel.java:303)
        at javax.swing.JTree.addSelectionPath(JTree.java:1701)
        at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2308)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3517)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.mouseReleasedDND(BasicTreeUI.java:3571)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.mouseReleased(BasicTreeUI.java:3559)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.Component.processMouseEvent(Component.java:6041)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5806)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3986)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimeableEventQueue.dispatchEvent(TimeableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)