Fatal error: Uncaught TypeError: PKP\section\PKPSection::getTitle(): Return value must be of type array|string, null returned in /var/www/html/lib/pkp/classes/section/PKPSection.php:68
Stack trace:
#0 /var/www/html/plugins/generic/citationStyleLanguage/CitationStyleLanguagePlugin.php(442): PKP\section\PKPSection->getTitle('hu')
#1 /var/www/html/plugins/generic/citationStyleLanguage/CitationStyleLanguagePlugin.php(332): APP\plugins\generic\citationStyleLanguage\CitationStyleLanguagePlugin->getCitation(Object(APP\core\Request), Object(APP\submission\Submission), 'apa', Object(APP\issue\Issue), Object(APP\publication\Publication))
#2 [internal function]: APP\plugins\generic\citationStyleLanguage\CitationStyleLanguagePlugin->getTemplateData('ArticleHandler:...', Array)
#3 /var/www/html/lib/pkp/classes/plugins/Hook.php(139): call_user_func_array(Array, Array)
#4 /var/www/html/lib/pkp/classes/plugins/Hook.php(113): PKP\plugins\Hook::run('ArticleHandler:...', Array)
#5 /var/www/html/pages/article/ArticleHandler.php(354): PKP\plugins\Hook::call('ArticleHandler:...', Array)
#6 [internal function]: APP\pages\article\ArticleHandler->view(Array, Object(APP\core\Request))
#7 /var/www/html/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request))
#8 /var/www/html/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array, false)
#9 /var/www/html/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route(Object(APP\core\Request))
#10 /var/www/html/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request))
#11 /var/www/html/index.php(21): PKP\core\PKPApplication->execute()
#12 {main}
thrown in /var/www/html/lib/pkp/classes/section/PKPSection.php on line 68