ErrorException: Trying to access array offset on value of type null
    #0 /home/www/www.com/app/custom/school/controller/MoCourse.php(66): Composer\Autoload\ClassLoader::sdopx\{closure}()
    #1 [internal function]: app\custom\school\controller\MoCourse->indexAction()
    #2 /home/www/www.com/vendor/wj008/beacon/core/Route.php(631): ReflectionMethod->invokeArgs()
    #3 /home/www/www.com/vendor/wj008/beacon/core/Route.php(744): beacon\Route::runMethod()
    #4 /home/www/www.com/www/index.php(87): beacon\Route::run()
    #5 {main}