javax.swing.text.BadLocationException: Invalid offset=246 not within <0, 245>
   at org.netbeans.modules.editor.lib2.DocUtils.checkOffsetValid(DocUtils.java:239)
   at org.netbeans.modules.editor.lib2.DocUtils.checkOffsetValid(DocUtils.java:234)
   at org.netbeans.modules.editor.lib2.DocUtils.getRowStart(DocUtils.java:70)
   at org.netbeans.modules.editor.lib2.highlighting.CaretBasedBlockHighlighting$CaretRowHighlighting.getCurrentBlockPositions(CaretBasedBlockHighlighting.java:303)
   at org.netbeans.modules.editor.lib2.highlighting.CaretBasedBlockHighlighting.updateLineInfo(CaretBasedBlockHighlighting.java:216)
   at org.netbeans.modules.editor.lib2.highlighting.CaretBasedBlockHighlighting.stateChanged(CaretBasedBlockHighlighting.java:204)
   at org.openide.util.WeakListenerImpl$Change.stateChanged(WeakListenerImpl.java:356)
   at org.netbeans.api.editor.caret.EditorCaret$5.run(EditorCaret.java:1692)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)