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

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java.lang.NullPointerException:
at sun.awt.X11.XMenuPeer.repaintMenuItem(XMenuPeer.java:360)
at sun.awt.X11.XCheckboxMenuItemPeer.setState(XCheckboxMenuItemPeer.java:46)
at java.awt.CheckboxMenuItem.setState(CheckboxMenuItem.java:177)
at ij.Menus.updateMenus(Menus.java:817)
at ij.WindowManager.setCurrentWindow(WindowManager.java:47)
at ij.WindowManager.addImageWindow(WindowManager.java:146)
at ij.WindowManager.addWindow(WindowManager.java:136)
at ij.gui.ImageWindow.(ImageWindow.java:67)
at ij.gui.ImageWindow.(ImageWindow.java:45)
at ij.ImagePlus.show(ImagePlus.java:300)
at ij.ImagePlus.show(ImagePlus.java:281)
at ij.plugin.AboutBox.run(AboutBox.java:70)
at ij.IJ.runPlugIn(IJ.java:101)
at ij.Executer.runPlugIn(Executer.java:170)
at ij.Executer.runCommand(Executer.java:129)
at ij.Executer.run(Executer.java:62)
at java.lang.Thread.run(Thread.java:595)

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