NullPointerException with Ctrl+Shift+W (close all tabs)

This Exception occurs whenever I try to close all tabs by using Ctrl+Shift+W (Close All Tabs)

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at com.lirtistasya.mobtalkeride.gui.MainFrame$22.stateChanged(MainFrame.java:404)
    at javax.swing.JTabbedPane.fireStateChanged(JTabbedPane.java:416)
    at javax.swing.JTabbedPane$ModelListener.stateChanged(JTabbedPane.java:270)
    at javax.swing.DefaultSingleSelectionModel.fireStateChanged(DefaultSingleSelectionModel.java:132)
    at javax.swing.DefaultSingleSelectionModel.setSelectedIndex(DefaultSingleSelectionModel.java:67)
    at javax.swing.JTabbedPane.setSelectedIndexImpl(JTabbedPane.java:616)
    at javax.swing.JTabbedPane.removeTabAt(JTabbedPane.java:975)
    at com.lirtistasya.mobtalkeride.gui.MainFrame.closeTab(MainFrame.java:1339)
    at com.lirtistasya.mobtalkeride.gui.MainFrame$5.actionPerformed(MainFrame.java:142)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
    at javax.swing.AbstractButton.doClick(AbstractButton.java:356)
    at javax.swing.plaf.basic.BasicMenuItemUI$Actions.actionPerformed(BasicMenuItemUI.java:802)
    at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1664)
    ...

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