Warning: assert(): assert(is_a($issue, 'Issue')) failed in /var/www/html/classes/issue/IssueAction.inc.php on line 29
Fatal error: Uncaught Error: Call to a member function getJournalId() on null in /var/www/html/classes/issue/IssueAction.inc.php:31
Stack trace:
#0 /var/www/html/pages/search/SearchHandler.inc.php(250): IssueAction->subscriptionRequired(NULL, Object(Journal))
#1 /var/www/html/lib/pkp/classes/core/PKPRouter.inc.php(395): SearchHandler->authors(Array, Object(Request))
#2 /var/www/html/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false)
#3 /var/www/html/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route(Object(Request))
#4 /var/www/html/lib/pkp/classes/core/PKPApplication.inc.php(362): Dispatcher->dispatch(Object(Request))
#5 /var/www/html/index.php(68): PKPApplication->execute()
#6 {main}
thrown in /var/www/html/classes/issue/IssueAction.inc.php on line 31