500 Internal Server Error

Attempt to read property "slug" on bool (2)

#0 /var/www/perantichecontrade.it/public_html/utils/resourcecached.php(137): flight\Engine->handleError()
#1 /var/www/perantichecontrade.it/public_html/utils/cache.php(82): ResourceCached->{closure}()
#2 /var/www/perantichecontrade.it/public_html/utils/resourcecached.php(148): Cache::make()
#3 /var/www/perantichecontrade.it/public_html/index.php(506): ResourceCached->getcurrentexhibition()
#4 /var/www/perantichecontrade.it/public_html/index.php(119): singleColumn()
#5 [internal function]: {closure}()
#6 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(354): call_user_func_array()
#7 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(287): flight\core\Dispatcher->invokeCallable()
#8 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/Engine.php(544): flight\core\Dispatcher->execute()
#9 [internal function]: flight\Engine->_start()
#10 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(376): call_user_func_array()
#11 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(287): flight\core\Dispatcher->invokeCallable()
#12 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(131): flight\core\Dispatcher->execute()
#13 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/core/Dispatcher.php(95): flight\core\Dispatcher->runEvent()
#14 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/Engine.php(113): flight\core\Dispatcher->run()
#15 /var/www/perantichecontrade.it/public_html/vendor/flightphp/core/flight/Flight.php(119): flight\Engine->__call()
#16 /var/www/perantichecontrade.it/public_html/index.php(532): Flight::__callStatic()
#17 {main}