{"action":"opened","issue":{"url":"https://api.github.com/repos/CeON/CERMINE/issues/52","repository_url":"https://api.github.com/repos/CeON/CERMINE","labels_url":"https://api.github.com/repos/CeON/CERMINE/issues/52/labels{/name}","comments_url":"https://api.github.com/repos/CeON/CERMINE/issues/52/comments","events_url":"https://api.github.com/repos/CeON/CERMINE/issues/52/events","html_url":"https://github.com/CeON/CERMINE/issues/52","id":235066539,"number":52,"title":"NullPointerException thrown for some articles","user":{"login":"maxxkia","id":6916434,"avatar_url":"https://avatars0.githubusercontent.com/u/6916434?v=3","gravatar_id":"","url":"https://api.github.com/users/maxxkia","html_url":"https://github.com/maxxkia","followers_url":"https://api.github.com/users/maxxkia/followers","following_url":"https://api.github.com/users/maxxkia/following{/other_user}","gists_url":"https://api.github.com/users/maxxkia/gists{/gist_id}","starred_url":"https://api.github.com/users/maxxkia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/maxxkia/subscriptions","organizations_url":"https://api.github.com/users/maxxkia/orgs","repos_url":"https://api.github.com/users/maxxkia/repos","events_url":"https://api.github.com/users/maxxkia/events{/privacy}","received_events_url":"https://api.github.com/users/maxxkia/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-06-11T13:44:14Z","updated_at":"2017-06-11T13:44:14Z","closed_at":null,"body":"Hi,\r\nWhen I tried to parse the following documents\r\n- http://www.lrec-conf.org/proceedings/lrec2014/pdf/14_Paper.pdf\r\n- http://nbn-resolving.de/urn:nbn:de:0168-ssoar-424669\r\n- http://nbn-resolving.de/urn:nbn:de:0168-ssoar-457680\r\n- http://www.lrec-conf.org/proceedings/lrec2016/pdf/71_Paper.pdf\r\n- http://www.lrec-conf.org/proceedings/lrec2016/pdf/86_Paper.pdf\r\n\r\nWith the following piece of code:\r\n```\r\nElement result = extractor.getContentAsNLM();\r\n```\r\n\r\nI get the following exception\r\n```\r\nException in thread \"main\" java.lang.NullPointerException\r\n\tat pl.edu.icm.cermine.metadata.transformers.MetadataToNLMConverter.convertJournalMetadata(MetadataToNLMConverter.java:61)\r\n\tat pl.edu.icm.cermine.metadata.transformers.MetadataToNLMConverter.convert(MetadataToNLMConverter.java:42)\r\n\tat pl.edu.icm.cermine.InternalContentExtractor.getMetadataAsNLM(InternalContentExtractor.java:198)\r\n\tat pl.edu.icm.cermine.InternalContentExtractor.getContentAsNLM(InternalContentExtractor.java:303)\r\n\tat pl.edu.icm.cermine.ContentExtractor.getContentAsNLM(ContentExtractor.java:662)\r\n\tat pl.edu.icm.cermine.ContentExtractor.getContentAsNLM(ContentExtractor.java:678)\r\n```"}}
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