java.lang.ArrayIndexOutOfBoundsException: -1
	at javax.swing.text.BoxView.getOffset(BoxView.java:1075)
	at javax.swing.text.BoxView.childAllocation(BoxView.java:669)
	at javax.swing.text.CompositeView.getChildAllocation(CompositeView.java:215)
	at javax.swing.text.BoxView.getChildAllocation(BoxView.java:427)
	at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.calculateViewPosition(BasicTextUI.java:1895)
	at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.layoutContainer(BasicTextUI.java:1871)
	at java.awt.Container.layout(Container.java:1419)
	at java.awt.Container.doLayout(Container.java:1408)
	at java.awt.Container.validateTree(Container.java:1491)
	at java.awt.Container.validateTree(Container.java:1498)
	at java.awt.Container.validateTree(Container.java:1498)
	at java.awt.Container.validate(Container.java:1466)
	at javax.swing.JViewport.validateView(JViewport.java:491)
	at javax.swing.JViewport.scrollRectToVisible(JViewport.java:365)
	at javax.swing.JComponent.scrollRectToVisible(JComponent.java:3082)
	at javax.swing.text.DefaultCaret.adjustVisibility(DefaultCaret.java:268)
	at javax.swing.text.DefaultCaret.repaintNewCaret(DefaultCaret.java:1293)
[catch] at javax.swing.text.DefaultCaret$1.run(DefaultCaret.java:1267)
	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)