Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, int given in /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/statistics/PKPStatisticsHelper.php:304 Stack trace: #0 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/statistics/PKPStatisticsHelper.php(304): array_key_exists() #1 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/observers/listeners/LogUsageEvent.php(144): PKP\statistics\PKPStatisticsHelper->getInstitutionIds() #2 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/observers/listeners/LogUsageEvent.php(53): PKP\observers\listeners\LogUsageEvent->prepareUsageEvent() #3 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php(441): PKP\observers\listeners\LogUsageEvent->handle() #4 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php(249): Illuminate\Events\Dispatcher->Illuminate\Events\{closure}() #5 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php(451): Illuminate\Events\Dispatcher->dispatch() #6 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/pages/article/ArticleHandler.php(502): event() #7 [internal function]: APP\pages\article\ArticleHandler->download() #8 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/core/PKPRouter.php(334): call_user_func() #9 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/core/PKPPageRouter.php(278): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #10 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route() #11 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/core/PKPApplication.php(395): PKP\core\Dispatcher->dispatch() #12 /home/u234354444/domains/uinjkt.ac.id/public_html/journal/index.php(21): PKP\core\PKPApplication->execute() #13 {main} thrown in /home/u234354444/domains/uinjkt.ac.id/public_html/journal/lib/pkp/classes/statistics/PKPStatisticsHelper.php on line 304