java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javax.swing.text.CompositeView.replace(CompositeView.java:170)
at javax.swing.text.View.updateChildren(View.java:1126)
at javax.swing.text.View.insertUpdate(View.java:710)
at javax.swing.text.FlowView.insertUpdate(FlowView.java:236)
at javax.swing.text.View.forwardUpdateToView(View.java:1217)
at javax.swing.text.View.forwardUpdate(View.java:1192)
at javax.swing.text.BoxView.forwardUpdate(BoxView.java:222)
at javax.swing.text.View.insertUpdate(View.java:716)
at javax.swing.plaf.basic.BasicTextUI$RootView.insertUpdate(BasicTextUI.java:1487)
at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.insertUpdate(BasicTextUI.java:1726)
at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:184)
at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:749)
at javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:706)
at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:668)
at javax.swing.JTextPane.replaceSelection(JTextPane.java:186)
at javax.swing.JTextPane.replaceSelection(JTextPane.java:153)
at javax.swing.text.StyledEditorKit$StyledInsertBreakAction.actionPerformed(StyledEditorKit.java:852)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1530)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2438)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2473)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2401)
at java.awt.Component.processEvent(Component.java:4909)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1713)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:627)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592)
at java.awt.Component.dispatchEventImpl(Component.java:3506)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

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