java.lang.NullPointerException
        at org.netbeans.modules.form.FormDesigner.componentIds(FormDesigner.java:2103)
        at org.netbeans.modules.form.FormDesigner.updateResizabilityActions(FormDesigner.java:1044)
        at org.netbeans.modules.form.FormDesigner.selectionChanged(FormDesigner.java:1007)
        at org.netbeans.modules.form.FormDesigner.clearSelectionImpl(FormDesigner.java:1002)
        at org.netbeans.modules.form.ComponentInspector$NodeSelectionListener.propertyChange(ComponentInspector.java:515)
        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$1AtomicSetSelectedNodes.fire(ExplorerManager.java:260)
        at org.openide.explorer.ExplorerManager.setSelectedNodes(ExplorerManager.java:273)
        at org.openide.explorer.view.BeanTreeView.selectionChanged(BeanTreeView.java:158)
        at org.openide.explorer.view.TreeView.callSelectionChanged(TreeView.java:752)
        at org.openide.explorer.view.TreeView$TreePropertyListener.valueChanged(TreeView.java:1284)
        at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
        at javax.swing.tree.DefaultTreeSelectionModel.clearSelection(DefaultTreeSelectionModel.java:570)
        at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:740)
        at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:626)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.treeStructureChanged(BasicTreeUI.java:3829)
        at javax.swing.tree.DefaultTreeModel.fireTreeStructureChanged(DefaultTreeModel.java:561)
        at javax.swing.tree.DefaultTreeModel.nodeStructureChanged(DefaultTreeModel.java:347)
        at javax.swing.tree.DefaultTreeModel.setRoot(DefaultTreeModel.java:117)
        at org.openide.explorer.view.NodeTreeModel$1.run(NodeTreeModel.java:106)
        at org.openide.util.Mutex.doEvent(Mutex.java:1335)
        at org.openide.util.Mutex.readAccess(Mutex.java:345)
        at org.openide.explorer.view.NodeTreeModel.setNode(NodeTreeModel.java:92)
        at org.openide.explorer.view.TreeView.synchronizeRootContext(TreeView.java:764)
        at org.openide.explorer.view.TreeView$TreePropertyListener.propertyChange(TreeView.java:1127)
        at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:186)
        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$1SetRootContext.run(ExplorerManager.java:466)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.explorer.ExplorerManager.setRootContext(ExplorerManager.java:478)
        at org.netbeans.modules.form.ComponentInspector.focusFormImpl(ComponentInspector.java:307)
        at org.netbeans.modules.form.ComponentInspector.focusFormInAwtThread(ComponentInspector.java:270)
        at org.netbeans.modules.form.ComponentInspector.focusForm(ComponentInspector.java:255)
        at org.netbeans.modules.form.FormEditor.closeForm(FormEditor.java:729)
        at org.netbeans.modules.form.FormEditorSupport$3.run(FormEditorSupport.java:432)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        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)