Erro 8

Trying to access array offset on value of type null

#0 /home/imobalcom/public_html/Site/Controllers/ProdutoController.php(86): Slim\Slim::handleErrors(8, 'Trying to acces...', '/home/imobalcom...', 86, Array)
#1 [internal function]: Site\Controllers\ProdutoController->indexAction()
#2 /home/imobalcom/public_html/vendor/slim/slim/Slim/Route.php(468): call_user_func_array(Array, Array)
#3 /home/imobalcom/public_html/vendor/slim/slim/Slim/Slim.php(1355): Slim\Route->dispatch()
#4 /home/imobalcom/public_html/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call()
#5 /home/imobalcom/public_html/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()
#6 /home/imobalcom/public_html/Site/Middlewares/OnlineMiddleware.php(27): Slim\Middleware\MethodOverride->call()
#7 /home/imobalcom/public_html/App/Middlewares/SecurityMiddleware.php(27): Site\Middlewares\OnlineMiddleware->call()
#8 /home/imobalcom/public_html/vendor/slim/slim/Slim/Slim.php(1300): App\Middlewares\SecurityMiddleware->call()
#9 /home/imobalcom/public_html/App/App.php(317): Slim\Slim->run()
#10 /home/imobalcom/public_html/App/App.php(86): App\App->run()
#11 /home/imobalcom/public_html/index.php(60): App\App->__construct()
#12 {main}

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