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This exception has no message.
java.lang.NullPointerException: 	at net.sf.jabref.preferences.JabRefPreferences.getBooleanDefault(JabRefPreferences.java:986)	at net.sf.jabref.preferences.JabRefPreferences.getBoolean(JabRefPreferences.java:978)	at net.sf.jabref.model.entry.InternalBibtexFields.(InternalBibtexFields.java:72)	at net.sf.jabref.JabRefMain.start(JabRefMain.java:70)	at net.sf.jabref.JabRefMain.lambda$0(JabRefMain.java:52)	at java.awt.event.InvocationEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$500(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)