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TypeError: FrontEnd\Model\Brands\BrandsDAO::getBrandName(): Return value must be of type string, null returned in /var/www/frontend/Model/Brands/BrandsDAO.php:31 Stack trace: #0 /var/www/frontend/Model/Brands/BrandsModel.php(23): FrontEnd\Model\Brands\BrandsDAO->getBrandName('black-friday') #1 /var/www/frontend/Controller/Brands/Brand.php(108): FrontEnd\Model\Brands\BrandsModel->getBrandName('black-friday') #2 /var/www/lib/Http/Server/Middleware.php(22): FrontEnd\Controller\Brands\Brand->handle(Object(GuzzleHttp\Psr7\ServerRequest)) #3 /var/www/lib/Http/Server/Handler/ServerRequestHandler.php(29): Http\Server\Middleware->process(Object(GuzzleHttp\Psr7\ServerRequest), Object(FrontEnd\Controller\Brands\Brand)) #4 /var/www/html/szexshop.net/index.php(339): Http\Server\Handler\ServerRequestHandler->handleServerRequest() #5 {main} Next Http\Exception\HttpException: FrontEnd\Model\Brands\BrandsDAO::getBrandName(): Return value must be of type string, null returned in /var/www/lib/Http/Server/Middleware.php:27 Stack trace: #0 /var/www/lib/Http/Server/Handler/ServerRequestHandler.php(29): Http\Server\Middleware->process(Object(GuzzleHttp\Psr7\ServerRequest), Object(FrontEnd\Controller\Brands\Brand)) #1 /var/www/html/szexshop.net/index.php(339): Http\Server\Handler\ServerRequestHandler->handleServerRequest() #2 {main}