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

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at net.sf.jabref.logic.importer.fileformat.MedlineImporter.addArticleInformation(
at net.sf.jabref.logic.importer.fileformat.MedlineImporter.parseArticle(
at net.sf.jabref.logic.importer.fileformat.MedlineImporter.importDatabase(
at net.sf.jabref.gui.importer.fetcher.MedlineFetcher.fetchMedline(
at net.sf.jabref.gui.importer.fetcher.MedlineFetcher.processQuery(
at net.sf.jabref.gui.importer.fetcher.GeneralFetcher.lambda$actionPerformed$5(

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