{"action":"created","issue":{"url":"https://api.github.com/repos/CrossRef/pdfextract/issues/6","labels_url":"https://api.github.com/repos/CrossRef/pdfextract/issues/6/labels{/name}","comments_url":"https://api.github.com/repos/CrossRef/pdfextract/issues/6/comments","events_url":"https://api.github.com/repos/CrossRef/pdfextract/issues/6/events","html_url":"https://github.com/CrossRef/pdfextract/issues/6","id":13002777,"number":6,"title":"error: undefined method `*' for nil:NilClass","user":{"login":"semorrison","id":477956,"avatar_url":"https://avatars.githubusercontent.com/u/477956?v=3","gravatar_id":"","url":"https://api.github.com/users/semorrison","html_url":"https://github.com/semorrison","followers_url":"https://api.github.com/users/semorrison/followers","following_url":"https://api.github.com/users/semorrison/following{/other_user}","gists_url":"https://api.github.com/users/semorrison/gists{/gist_id}","starred_url":"https://api.github.com/users/semorrison/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/semorrison/subscriptions","organizations_url":"https://api.github.com/users/semorrison/orgs","repos_url":"https://api.github.com/users/semorrison/repos","events_url":"https://api.github.com/users/semorrison/events{/privacy}","received_events_url":"https://api.github.com/users/semorrison/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2013-04-10T03:40:12Z","updated_at":"2015-06-16T00:24:00Z","closed_at":null,"body":"Under Ruby 1.9.3 (with pdf-reader downgraded to 1.1.1), I get\r\n\r\n```$ pdf-extract extract --references example.pdf```\r\n\r\n    error: undefined method `*' for nil:NilClass. Use --trace to view backtrace\r\n\r\nUnder Ruby 1.9.1 (again with pdf-reader at 1.1.1), I get\r\n\r\n```$ pdf-extract extract --references example.pdf```\r\n\r\n    error: undefined method `sort_by!' for #<Array:0x007fa62e9cc930>. Use --trace to view backtrace\r\n\r\nAny suggestions? I'm not sure what else to try, but am excited to get pdfextract running!\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/CrossRef/pdfextract/issues/comments/112243423","html_url":"https://github.com/CrossRef/pdfextract/issues/6#issuecomment-112243423","issue_url":"https://api.github.com/repos/CrossRef/pdfextract/issues/6","id":112243423,"user":{"login":"jgrossi","id":1175275,"avatar_url":"https://avatars.githubusercontent.com/u/1175275?v=3","gravatar_id":"","url":"https://api.github.com/users/jgrossi","html_url":"https://github.com/jgrossi","followers_url":"https://api.github.com/users/jgrossi/followers","following_url":"https://api.github.com/users/jgrossi/following{/other_user}","gists_url":"https://api.github.com/users/jgrossi/gists{/gist_id}","starred_url":"https://api.github.com/users/jgrossi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jgrossi/subscriptions","organizations_url":"https://api.github.com/users/jgrossi/orgs","repos_url":"https://api.github.com/users/jgrossi/repos","events_url":"https://api.github.com/users/jgrossi/events{/privacy}","received_events_url":"https://api.github.com/users/jgrossi/received_events","type":"User","site_admin":false},"created_at":"2015-06-16T00:24:00Z","updated_at":"2015-06-16T00:24:00Z","body":"@semorrison Hi! Sorry about replying on this topic again. I'm trying to run `pdf-extract`. For some PDF papers it runs very well, but some I get these errors with a blank output :\r\n\r\n- `error: undefined method `[]' for nil:NilClass. Use --trace to view backtrace` and\r\n- `error: undefined method `*' for nil:NilClass. Use --trace to view backtrace`\r\n\r\nI'm using Ruby 2.0.0 and pdf-reader 1.1.1. Do you know can I solve this?\r\n\r\n\r\n"}}