SEVERE: Attempt to remove from guarded block at position 812.
org.netbeans.editor.GuardedException: Attempt to remove from guarded block at position 812.
        at org.netbeans.editor.GuardedDocument.preRemoveCheck(GuardedDocument.java:192)
        at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:741)
[catch] at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.rollback(EditableDiffView.java:383)
        at org.netbeans.modules.diff.builtin.visualizer.editable.LineNumbersActionsBar.performAction(LineNumbersActionsBar.java:166)
        at org.netbeans.modules.diff.builtin.visualizer.editable.LineNumbersActionsBar.mouseClicked(LineNumbersActionsBar.java:173)
        at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212)
        at java.awt.Component.processMouseEvent(Component.java:5504)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
        at java.awt.Component.processEvent(Component.java:5266)
        at java.awt.Container.processEvent(Container.java:1966)
        at java.awt.Component.dispatchEventImpl(Component.java:3968)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
        at java.awt.Container.dispatchEventImpl(Container.java:2010)
        at java.awt.Window.dispatchEventImpl(Window.java:1778)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)