java.lang.NullPointerException

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    • java.lang.NullPointerException at java.util.Objects.requireNonNull(Unknown Source) at net.sf.jabref.gui.groups.GroupSelector.setGroups(GroupSelector.java:725) at net.sf.jabref.gui.groups.GroupSelector.<init>(GroupSelector.java:356) at net.sf.jabref.gui.JabRefFrame.initSidePane(JabRefFrame.java:693) at net.sf.jabref.gui.JabRefFrame.init(JabRefFrame.java:600) at net.sf.jabref.gui.JabRefFrame.<init>(JabRefFrame.java:528) at net.sf.jabref.JabRefGUI.openWindow(JabRefGUI.java:114) at net.sf.jabref.JabRefGUI.<init>(JabRefGUI.java:70) at net.sf.jabref.JabRefMain.lambda$start$1(JabRefMain.java:108)

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