PHP Fatal error: Uncaught Error: Call to a member function getId() on null in /classes/oai/ojs/OAIDAO.inc.php:185

Software Support
1

When I enable OJS access distribution, the OAI returns an HTTP ERROR 500 error.
Checking erro_log, I get this.

[Sat Jun 18 17:07:53.750733 2022] [php7:error] [pid 25697] [client 181.66.195.133:42979] PHP Fatal error: Uncaught Error: Call to a member function getId() on null in /var/www/ojs_university/classes/oai/ojs/OAIDAO.inc.php:185\nStack trace:\n#0 /var/www/ojs_university/lib/pkp/classes/oai/PKPOAIDAO.inc.php(239): OAIDAO->setOAIData()\n#1 /var/www/ojs_university/lib/pkp/classes/oai/PKPOAIDAO.inc.php(203): PKPOAIDAO->_doCommonOAIFromRowOperations()\n#2 /var/www/ojs_university/lib/pkp/classes/oai/PKPOAIDAO.inc.php(132): PKPOAIDAO->_returnRecordFromRow()\n#3 /var/www/ojs_university/classes/oai/ojs/JournalOAI.inc.php(178): PKPOAIDAO->getRecords()\n#4 /var/www/ojs_university/lib/pkp/classes/oai/OAI.inc.php(507): JournalOAI->records()\n#5 /var/www/ojs_university/lib/pkp/classes/oai/OAI.inc.php(85): OAI->ListRecords()\n#6 /var/www/ojs_university/pages/oai/OAIHandler.inc.php(39): OAI->execute()\n#7 /var/www/ojs_university/lib/pkp/classes/core/PKPRouter.inc.php(395): OAIHandler->index()\n#8 /var/www/ojs_university/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest()\n#9 /var/www/ojs_university in /var/www/ojs_university/classes/oai/ojs/OAIDAO.inc.php on line 185

The ojs version is OJS 3.3.0.9

2

Hello,
I am also getting the same error, has anyone found a solution?
OJS: 3.4.0.6
OS: Linux
Database server version: 10.6.18-MariaDB-0ubuntu0.22.04.1

[php:error] [pid 37808:tid 37808] [client xxx.xxx.xxx.xxx:26964] PHP Fatal error: Uncaught Error: Call to a member function getId() on null in classes/oai/ojs/OAIDAO.php:225\nStack trace:\n#0 lib/pkp/classes/oai/PKPOAIDAO.php(261): APP\oai\ojs\OAIDAO->setOAIData()\n#1 lib/pkp/classes/oai/PKPOAIDAO.php(219): PKP\oai\PKPOAIDAO->_doCommonOAIFromRowOperations()\n#2 lib/pkp/classes/oai/PKPOAIDAO.php(153): PKP\oai\PKPOAIDAO->_returnRecordFromRow()\n#3 classes/oai/ojs/JournalOAI.php(195): PKP\oai\PKPOAIDAO->getRecords()\n#4 lib/pkp/classes/oai/OAI.php(5425

Thanks
Nason

3

Hi @Nason_Bimbe,

It looks like you have a data error. Try the following database query:

SELECT s.* FROM submissions s LEFT JOIN publications p ON (s.current_publication_id = p.publication_id) WHERE p.publication_id IS NULL;

If you have any results, then it indicates that you have a submission without a publication. You should probably delete the submissions entry. (Make sure to take a backup before working with the database directly!)

Regards,
Alec Smecher
Public Knowledge Project Team

5

Thank you @asmecher

I will give it a go and feedback

Regards
Nason

6

Hi @asmecher

I have run the query and this is the result. No records found.

MariaDB [xxxx]> SELECT s.* FROM submissions s LEFT JOIN publications p ON (s.current_publication_id = p.publication_id) WHERE p.publication_id IS NULL;
Empty set (0.072 sec)
7

Hi @Nason_Bimbe,

Hmm, I don’t see another cause at a glance. Is it possible that the error message was received with your database in a different state that has since been resolved? Or do you see this error message frequently (e.g. every time you access the OAI interface)?

Regards,
Alec Smecher
Public Knowledge Project Team

8

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