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java.util.NoSuchElementException: node has no children	at javax.swing.tree.DefaultMutableTreeNode.getFirstChild(DefaultMutableTreeNode.java:864)	at org.hsqldb.util.DatabaseManagerSwing$PopupListener.getCommandString(DatabaseManagerSwing.java:2114)	at org.hsqldb.util.DatabaseManagerSwing$PopupListener.toString(DatabaseManagerSwing.java:2046)	at org.hsqldb.util.DatabaseManagerSwing.handlePopup(DatabaseManagerSwing.java:1999)	at org.hsqldb.util.DatabaseManagerSwing.mouseReleased(DatabaseManagerSwing.java:1960)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273)	at java.awt.Component.processMouseEvent(Component.java:6263)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)	at java.awt.Component.processEvent(Component.java:6028)	at java.awt.Container.processEvent(Container.java:2041)	at java.awt.Component.dispatchEventImpl(Component.java:4630)	at java.awt.Container.dispatchEventImpl(Container.java:2099)	at java.awt.Component.dispatchEvent(Component.java:4460)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)	at java.awt.Container.dispatchEventImpl(Container.java:2085)	at java.awt.Window.dispatchEventImpl(Window.java:2478)	at java.awt.Component.dispatchEvent(Component.java:4460)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)