Slim Application Error

The application could not run because of the following error:
Details

Type: Error
Code: 0
Message: Attempt to assign property "title" on null
File: /var/www/clients/client0/web2/web/app/Controllers/SeoController.php
Line: 148
Trace

#0 /var/www/clients/client0/web2/web/app/Controllers/EventController.php(314): App\Controllers\SeoController::generateSeo()
#1 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponseArgs.php(36): App\Controllers\EventController->getEventsBySport()
#2 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/Routing/Route.php(358): Slim\Handlers\Strategies\RequestResponseArgs->__invoke()
#3 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Slim\Routing\Route->handle()
#4 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Slim\MiddlewareDispatcher->handle()
#5 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/Routing/Route.php(315): Slim\MiddlewareDispatcher->handle()
#6 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/Routing/RouteRunner.php(68): Slim\Routing\Route->run()
#7 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/Middleware/ErrorMiddleware.php(76): Slim\Routing\RouteRunner->handle()
#8 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(121): Slim\Middleware\ErrorMiddleware->process()
#9 /var/www/clients/client0/web2/web/app/Middleware/PageCacheMiddleware.php(31): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#10 /var/www/clients/client0/web2/web/vendor/symfony/cache/LockRegistry.php(111): App\Middleware\PageCacheMiddleware->App\Middleware\{closure}()
#11 /var/www/clients/client0/web2/web/vendor/symfony/cache/Traits/ContractsTrait.php(102): Symfony\Component\Cache\LockRegistry::compute()
#12 /var/www/clients/client0/web2/web/vendor/symfony/cache-contracts/CacheTrait.php(64): Symfony\Component\Cache\Adapter\AbstractAdapter->Symfony\Component\Cache\Traits\{closure}()
#13 /var/www/clients/client0/web2/web/vendor/symfony/cache/Traits/ContractsTrait.php(85): Symfony\Component\Cache\Adapter\AbstractAdapter->contractsGet()
#14 /var/www/clients/client0/web2/web/vendor/symfony/cache-contracts/CacheTrait.php(30): Symfony\Component\Cache\Adapter\AbstractAdapter->doGet()
#15 /var/www/clients/client0/web2/web/app/Middleware/PageCacheMiddleware.php(30): Symfony\Component\Cache\Adapter\AbstractAdapter->get()
#16 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(269): App\Middleware\PageCacheMiddleware->__invoke()
#17 /var/www/clients/client0/web2/web/app/Middleware/ValidationErrorsMiddleware.php(22): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#18 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(269): App\Middleware\ValidationErrorsMiddleware->__invoke()
#19 /var/www/clients/client0/web2/web/app/Middleware/OldInputMiddleware.php(23): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#20 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(269): App\Middleware\OldInputMiddleware->__invoke()
#21 /var/www/clients/client0/web2/web/app/Middleware/CsrfViewMiddleware.php(30): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#22 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(269): App\Middleware\CsrfViewMiddleware->__invoke()
#23 /var/www/clients/client0/web2/web/app/Middleware/MainMiddleware.php(188): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#24 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(269): App\Middleware\MainMiddleware->__invoke()
#25 /var/www/clients/client0/web2/web/vendor/selective/basepath/src/BasePathMiddleware.php(52): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#26 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(121): Selective\BasePath\BasePathMiddleware->process()
#27 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#28 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/App.php(199): Slim\MiddlewareDispatcher->handle()
#29 /var/www/clients/client0/web2/web/vendor/slim/slim/Slim/App.php(183): Slim\App->handle()
#30 /var/www/clients/client0/web2/web/public/index.php(16): Slim\App->run()
#31 {main}