OJS系统升级PHP8.0出现CrossRef XML导出错误

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PHP Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /var/www/html/ojs/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php:182
Stack trace:
#0 /var/www/html/ojs/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php(182): array_keys(NULL)
#1 /var/www/html/ojs/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php(49): ArticleCrossrefXmlFilter->createJournalArticleNode(Object(DOMDocument), Object(Submission))
#2 /var/www/html/ojs/plugins/importexport/crossref/filter/IssueCrossrefXmlFilter.inc.php(67): ArticleCrossrefXmlFilter->createJournalNode(Object(DOMDocument), Object(Submission))
#3 /var/www/html/ojs/lib/pkp/classes/filter/Filter.inc.php(449): IssueCrossrefXmlFilter->process(Array)
#4 /var/www/html/ojs/classes/plugins/PubObjectsExportPlugin.inc.php(391): Filter->execute(Array, true)
#5 /var/www/html/ojs/plugins/importexport/crossref/CrossRefExportPlugin.inc.php(214): PubObjectsExportPlugin->exportXML(Array, ‘article=>crossr…’, Object(Journal), true)
#6 /var/www/html/ojs/classes/plugins/PubObjectsExportPlugin.inc.php(171): CrossRefExportPlugin->executeExportAction(Object(Request), Array, ‘article=>crossr…’, ‘exportSubmissio…’, ‘articles’, true)
#7 /var/www/html/ojs/classes/plugins/DOIPubIdExportPlugin.inc.php(29): PubObjectsExportPlugin->display(Array, Object(Request))
#8 /var/www/html/ojs/lib/pkp/pages/management/PKPToolsHandler.inc.php(94): DOIPubIdExportPlugin->display(Array, Object(Request))
#9 /var/www/html/ojs/lib/pkp/classes/core/PKPRouter.inc.php(397): PKPToolsHandler->importexport(Array, Object(Request))
#10 /var/www/html/ojs/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false)
#11 /var/www/html/ojs/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route(Object(Request))
#12 /var/www/html/ojs/lib/pkp/classes/core/PKPApplication.inc.php(360): Dispatcher->dispatch(Object(Request))
#13 /var/www/html/ojs/index.php(68): PKPApplication->execute()
#14 {main}
thrown in /var/www/html/ojs/plugins/importexport/crossref/filter/ArticleCrossrefXmlFilter.inc.php on line 182