Fatal error: Uncaught TypeError: usort(): Argument #1 ($array) must be of type array, null given in /home/forge/dotravel.staging.dev.kickersoft.com/src/Product/Helper/Utility.php:2858 Stack trace: #0 /home/forge/dotravel.staging.dev.kickersoft.com/src/Product/Helper/Utility.php(2858): usort() #1 /home/forge/dotravel.staging.dev.kickersoft.com/src/Book/Helper/Utility.php(658): DoTravel\Product\Helper\Utility::getInformationSubProductStandard() #2 /home/forge/dotravel.staging.dev.kickersoft.com/src/Book/Controller/Frontend.php(337): DoTravel\Book\Helper\Utility::ing() #3 /home/forge/dotravel.staging.dev.kickersoft.com/src/Core/Controller/BaseController.php(129): DoTravel\Book\Controller\Frontend->ing() #4 /home/forge/dotravel.staging.dev.kickersoft.com/src/Bootstrap.php(109): DoTravel\Core\Controller\BaseController->run() #5 /home/forge/dotravel.staging.dev.kickersoft.com/src/Bootstrap.php(15): DoTravel\Bootstrap::dispatch() #6 /home/forge/dotravel.staging.dev.kickersoft.com/public/index.php(49): DoTravel\Bootstrap::run() #7 {main} thrown in /home/forge/dotravel.staging.dev.kickersoft.com/src/Product/Helper/Utility.php on line 2858