Fehler beim Aufruf der Seite "Verwaltung von Veranstaltungen"

Anscheinend liefert getIconNavigation() ein Array zurück:

Error: Call to a member function isVisible() on array in app/controllers/admin/courses.php:693
Stack trace:
#0 app/controllers/admin/courses.php(417): Admin_CoursesController->getCourseData()
#1 vendor/trails/trails.php(558): Admin_CoursesController->search_action()
#2 app/controllers/studip_controller.php(123): Trails_Controller->perform()
#3 vendor/trails/trails.php(154): StudipController->perform()
#4 vendor/trails/trails.php(121): Trails_Dispatcher->map_uri_to_response()
#5 public/dispatch.php(25): Trails_Dispatcher->dispatch()

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