Fatal error: Uncaught Error: Call to a member function getYear() on null in /var/www/ojs/plugins/generic/googleScholar/GoogleScholarPlugin.inc.php:102 Stack trace: #0 /var/www/ojs/lib/pkp/classes/plugins/HookRegistry.inc.php(107): GoogleScholarPlugin->submissionView('ArticleHandler:...', Array) #1 /var/www/ojs/pages/article/ArticleHandler.inc.php(286): HookRegistry::call('ArticleHandler:...', Array) #2 /var/www/ojs/lib/pkp/classes/core/PKPRouter.inc.php(391): ArticleHandler->view(Array, Object(Request)) #3 /var/www/ojs/lib/pkp/classes/core/PKPPageRouter.inc.php(231): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false) #4 /var/www/ojs/lib/pkp/classes/core/Dispatcher.inc.php(143): PKPPageRouter->route(Object(Request)) #5 /var/www/ojs/lib/pkp/classes/core/PKPApplication.inc.php(281): Dispatcher->dispatch(Object(Request)) #6 /var/www/ojs/index.php(68): PKPApplication->execute() #7 {main} thrown in /var/www/ojs/plugins/generic/googleScholar/GoogleScholarPlugin.inc.php on line 102