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java.lang.NullPointerException: null	at net.sf.jabref.gui.AbstractView.getView(AbstractView.java:25)	at net.sf.jabref.gui.help.AboutDialogView.show(AboutDialogView.java:15)	at net.sf.jabref.gui.help.AboutAction.lambda$actionPerformed$0(AboutAction.java:22)	at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)	at java.lang.Thread.run(Unknown Source)