Fatal error: Uncaught TypeError: Argument 1 passed to SenFramework\Billing::productOwned() must be of the type integer, null given, called in /home/lvlupdojo/public_html/vendor/SenFramework/Courses.php on line 85 and defined in /home/lvlupdojo/public_html/vendor/SenFramework/Billing.php:858 Stack trace: #0 /home/lvlupdojo/public_html/vendor/SenFramework/Courses.php(85): SenFramework\Billing->productOwned(NULL) #1 /home/lvlupdojo/public_html/vendor/SenFramework/Controllers/Courses.php(28): SenFramework\Courses->getCourse(10) #2 /home/lvlupdojo/public_html/vendor/SenFramework/Routing/Routing.php(225): SenFramework\Controllers\Courses->__construct(Array, Array) #3 /home/lvlupdojo/public_html/vendor/SenFramework/Routing/Routing.php(66): SenFramework\Routing\Routing->handle() #4 /home/lvlupdojo/public_html/vendor/SenFramework/SenFramework.php(771): SenFramework\Routing\Routing->__construct() #5 /home/lvlupdojo/public_html/app.php(8): SenFramework\SenFramework->Handle() #6 {main} thrown in /home/lvlupdojo/public_html/vendor/SenFramework/Billing.php on line 858