Warning: assert(): assert(is_a($issue, 'Issue')) failed in /htdocs/home/revistaterceiramargem.com/www/classes/issue/IssueAction.inc.php on line 29

Fatal error: Uncaught Error: Call to a member function getJournalId() on null in /htdocs/home/revistaterceiramargem.com/www/classes/issue/IssueAction.inc.php:31
Stack trace:
#0 /htdocs/home/revistaterceiramargem.com/www/pages/search/SearchHandler.inc.php(246): IssueAction->subscriptionRequired(NULL, Object(Journal))
#1 /htdocs/home/revistaterceiramargem.com/www/lib/pkp/classes/core/PKPRouter.inc.php(391): SearchHandler->authors(Array, Object(Request))
#2 /htdocs/home/revistaterceiramargem.com/www/lib/pkp/classes/core/PKPPageRouter.inc.php(231): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false)
#3 /htdocs/home/revistaterceiramargem.com/www/lib/pkp/classes/core/Dispatcher.inc.php(143): PKPPageRouter->route(Object(Request))
#4 /htdocs/home/revistaterceiramargem.com/www/lib/pkp/classes/core/PKPApplication.inc.php(281): Dispatcher->dispatch(Object(Request))
#5 /htdocs/home/revistaterceiramargem.com/www/index.php(68): PKPApplication->execute()
#6 {main}
  thrown in /htdocs/home/revistaterceiramargem.com/www/classes/issue/IssueAction.inc.php on line 31