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

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java.lang.NullPointerException:
at net.sf.jabref.logic.importer.fileformat.MedlineImporter.addArticleInformation(MedlineImporter.java:516)
at net.sf.jabref.logic.importer.fileformat.MedlineImporter.parseArticle(MedlineImporter.java:341)
at net.sf.jabref.logic.importer.fileformat.MedlineImporter.importDatabase(MedlineImporter.java:151)
at net.sf.jabref.gui.importer.fetcher.MedlineFetcher.fetchMedline(MedlineFetcher.java:226)
at net.sf.jabref.gui.importer.fetcher.MedlineFetcher.processQuery(MedlineFetcher.java:199)
at net.sf.jabref.gui.importer.fetcher.GeneralFetcher.lambda$actionPerformed$5(GeneralFetcher.java:223)

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