Slim Application Error

The application could not run because of the following error:

Details

Type: ErrorException
Code: 8
Message: Trying to access array offset on value of type null
File: /home/revistafutura/www/app/controllers/homeController.php
Line: 501

Trace

#0 /home/revistafutura/www/app/controllers/homeController.php(501): Slim\Slim::handleErrors(8, 'Trying to acces...', '/home/revistafu...', 501, Array)
#1 [internal function]: HomeController->blog_post('41', 'o-que-devemos-f...')
#2 /home/revistafutura/www/vendor/slim/slim/Slim/Route.php(173): call_user_func_array(Array, Array)
#3 [internal function]: Slim\Route->Slim\{closure}('41', 'o-que-devemos-f...')
#4 /home/revistafutura/www/vendor/slim/slim/Slim/Route.php(462): call_user_func_array(Object(Closure), Array)
#5 /home/revistafutura/www/vendor/slim/slim/Slim/Slim.php(1326): Slim\Route->dispatch()
#6 /home/revistafutura/www/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call()
#7 /home/revistafutura/www/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()
#8 /home/revistafutura/www/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#9 /home/revistafutura/www/vendor/slim/slim/Slim/Slim.php(1271): Slim\Middleware\PrettyExceptions->call()
#10 /home/revistafutura/www/index.php(57): Slim\Slim->run()
#11 {main}