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java.lang.NullPointerException: 	at $Proxy5.equals(Unknown Source)	at javax.swing.event.EventListenerList.remove(Unknown Source)	at javax.swing.JInternalFrame.removeInternalFrameListener(Unknown Source)	at javax.swing.plaf.basic.BasicInternalFrameUI$BasicInternalFrameListener.internalFrameClosed(Unknown Source)	at javax.swing.JInternalFrame.fireInternalFrameEvent(Unknown Source)	at javax.swing.JInternalFrame.dispose(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at jgr.SwingRenderer.call(SwingRenderer.java:483)	at jgr.SwingRenderer.event(SwingRenderer.java:274)	at jgr.SwingRenderer.access$200(SwingRenderer.java:9)	at jgr.SwingRenderer$1.invoke(SwingRenderer.java:203)	at $Proxy5.internalFrameClosing(Unknown Source)	at javax.swing.JInternalFrame.fireInternalFrameEvent(Unknown Source)	at javax.swing.JInternalFrame.doDefaultCloseAction(Unknown Source)	at javax.swing.plaf.basic.BasicInternalFrameTitlePane$CloseAction.actionPerformed(Unknown Source)	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)