Warning: Undefined array key "required" in /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/submission/GenreDAO.php on line 251

Fatal error: Uncaught TypeError: PKP\submission\Genre::setRequired(): Argument #1 ($required) must be of type bool, null given, called in /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/submission/GenreDAO.php on line 251 and defined in /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/submission/Genre.php:213 Stack trace: #0 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/submission/GenreDAO.php(251): PKP\submission\Genre->setRequired() #1 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/db/DAOResultFactory.php(135): PKP\submission\GenreDAO->_fromRow() #2 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/db/DAOResultFactory.php(233): PKP\db\DAOResultFactory->next() #3 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/pages/article/ArticleHandler.php(259): PKP\db\DAOResultFactory->toArray() #4 [internal function]: APP\pages\article\ArticleHandler->view() #5 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/core/PKPRouter.php(334): call_user_func() #6 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/core/PKPPageRouter.php(278): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #7 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route() #8 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/core/PKPApplication.php(395): PKP\core\Dispatcher->dispatch() #9 /home/u999915031/domains/pierreonline.uk/public_html/rseltl/index.php(21): PKP\core\PKPApplication->execute() #10 {main} thrown in /home/u999915031/domains/pierreonline.uk/public_html/rseltl/lib/pkp/classes/submission/Genre.php on line 213