OJS 3.1 Crossref failed with Uncaught Error: Call to a member function getGenreId() on null

Software Support
1

Hi I have tried to use the Crossref XML plugin, and when I select an article and press Download XML button i got a error page in the brower. I have reviewed my PHP logs and this is the message:

[03-Sep-2018 22:08:48 UTC] PHP Fatal error:  Uncaught Error: Call to a member function getGenreId() on null in /var/www/html/ojs3/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php:187
Stack trace:
#0 /var/www/html/ojs3/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php(49): ArticleCrossrefXmlFilter->createJournalArticleNode(Object(DOMDocument), Object(PublishedArticle))
#1 /var/www/html/ojs3/plugins/importexport/crossref/filter/IssueCrossrefXmlFilter.inc.php(67): ArticleCrossrefXmlFilter->createJournalNode(Object(DOMDocument), Object(PublishedArticle))
#2 /var/www/html/ojs3/lib/pkp/classes/filter/Filter.inc.php(449): IssueCrossrefXmlFilter->process(Array)
#3 /var/www/html/ojs3/classes/plugins/PubObjectsExportPlugin.inc.php(347): Filter->execute(Array, true)
#4 /var/www/html/ojs3/classes/plugins/PubObjectsExportPlugin.inc.php(180): PubObjectsExportPlugin->exportXML(Array, 'article=>crossr...', Object(Journal), false)
#5 /var/www/html/ojs3/plugins/importexport/crossref/CrossRefExportPlugin.inc.php(162): PubObjectsExp in /var/www/html/ojs3/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php on line 187

Someone may help me to resolve this trouble?

2

i have the same problem now.

any solution for this?

3

Hi all,

What is the exact version of OJS you’re using when you experience this problem?

Regards,
Alec Smecher
Public Knowledge Project Team

4

Hi @asmecher

I have the same issue in my OJS 3.1.0.1.

Regards
Ghazal

5

I looked up the newer version and there is already a check for null which will fix this. Thanks.