500 Internal Server Error

Trying to access array offset on value of type null (2)

#0 /var/www/perantichecontrade.it/public_html/utils/cache.php(96): flight\Engine->handleError()
#1 /var/www/perantichecontrade.it/public_html/utils/resourcecached.php(10): Cache::make()
#2 /var/www/perantichecontrade.it/public_html/index.php(339): ResourceCached->getitem()
#3 [internal function]: {closure}()
#4 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(354): call_user_func_array()
#5 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(287): flight\core\Dispatcher->invokeCallable()
#6 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/Engine.php(544): flight\core\Dispatcher->execute()
#7 [internal function]: flight\Engine->_start()
#8 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(376): call_user_func_array()
#9 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(287): flight\core\Dispatcher->invokeCallable()
#10 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(131): flight\core\Dispatcher->execute()
#11 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(95): flight\core\Dispatcher->runEvent()
#12 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/Engine.php(113): flight\core\Dispatcher->run()
#13 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/Flight.php(119): flight\Engine->__call()
#14 /var/www/perantichecontrade.it/public_html/index.php(532): Flight::__callStatic()
#15 {main}