OJS 3.3.0.8 DOAJ Export Plugin Problem

[14-Oct-2021 08:22:37 UTC] PHP Warning: DOMDocument::createTextNode() expects parameter 1 to be string, array given in C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php on line 213
[14-Oct-2021 08:22:37 UTC] PHP Stack trace:
[14-Oct-2021 08:22:37 UTC] PHP 1. {main}() C:\wamp\www\ojs-3.3.0-8\index.php:0
[14-Oct-2021 08:22:37 UTC] PHP 2. Application->execute() C:\wamp\www\ojs-3.3.0-8\index.php:68
[14-Oct-2021 08:22:37 UTC] PHP 3. Dispatcher->dispatch() C:\wamp\www\ojs-3.3.0-8\lib\pkp\classes\core\PKPApplication.inc.php:362
[14-Oct-2021 08:22:37 UTC] PHP 4. PageRouter->route() C:\wamp\www\ojs-3.3.0-8\lib\pkp\classes\core\Dispatcher.inc.php:144
[14-Oct-2021 08:22:37 UTC] PHP 5. PageRouter->_authorizeInitializeAndCallRequest() C:\wamp\www\ojs-3.3.0-8\lib\pkp\classes\core\PKPPageRouter.inc.php:246
[14-Oct-2021 08:22:37 UTC] PHP 6. PKPToolsHandler->importexport() C:\wamp\www\ojs-3.3.0-8\lib\pkp\classes\core\PKPRouter.inc.php:395
[14-Oct-2021 08:22:37 UTC] PHP 7. DOAJExportPlugin->display() C:\wamp\www\ojs-3.3.0-8\lib\pkp\pages\management\PKPToolsHandler.inc.php:94
[14-Oct-2021 08:22:37 UTC] PHP 8. DOAJExportPlugin->display() C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\DOAJExportPlugin.inc.php:52
[14-Oct-2021 08:22:37 UTC] PHP 9. DOAJExportPlugin->executeExportAction() C:\wamp\www\ojs-3.3.0-8\classes\plugins\PubObjectsExportPlugin.inc.php:171
[14-Oct-2021 08:22:37 UTC] PHP 10. DOAJExportPlugin->executeExportAction() C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\DOAJExportPlugin.inc.php:175
[14-Oct-2021 08:22:37 UTC] PHP 11. DOAJExportPlugin->exportXML() C:\wamp\www\ojs-3.3.0-8\classes\plugins\PubObjectsExportPlugin.inc.php:196
[14-Oct-2021 08:22:37 UTC] PHP 12. DOAJXmlFilter->execute() C:\wamp\www\ojs-3.3.0-8\classes\plugins\PubObjectsExportPlugin.inc.php:391
[14-Oct-2021 08:22:37 UTC] PHP 13. DOAJXmlFilter->process() C:\wamp\www\ojs-3.3.0-8\lib\pkp\classes\filter\Filter.inc.php:449
[14-Oct-2021 08:22:37 UTC] PHP 14. DOAJXmlFilter->createAuthorNode() C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php:136
[14-Oct-2021 08:22:37 UTC] PHP 15. DOMDocument->createTextNode() C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php:213
[14-Oct-2021 08:22:37 UTC] PHP Fatal error: Uncaught TypeError: Argument 1 passed to DOMNode::appendChild() must be an instance of DOMNode, null given in C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php:213
Stack trace:
#0 C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php(213): DOMNode->appendChild(NULL)
#1 C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php(136): DOAJXmlFilter->createAuthorNode(Object(DOMDocument), Object(Publication), Object(Author), Array)
#2 C:\wamp\www\ojs-3.3.0-8\lib\pkp\classes\filter\Filter.inc.php(449): DOAJXmlFilter->process(Array)
#3 C:\wamp\www\ojs-3.3.0-8\classes\plugins\PubObjectsExportPlugin.inc.php(391): Filter->execute(Array, true)
#4 C:\wamp\www\ojs-3.3.0-8\classes\plugins\PubObjectsExportPlugin.inc.php(196): PubObjectsExportPlugin->exportXML(Array, ‘article=>doaj-x…’, Object(Journal), false)
#5 C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\DOAJExportPlugin.inc.php(175): PubObjectsExportPlugin->executeExportAction(Object(Reques in C:\wamp\www\ojs-3.3.0-8\plugins\importexport\doaj\filter\DOAJXmlFilter.inc.php on line 213

Same error in my live site
Capture