Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Call to a member function getLabel() on null in /code/verbanent-legacy/src/Model/Domain/Source/Book/Model/BookModel.php:59 Stack trace: #0 /code/verbanent-legacy/src/Controller/TextController.php(165): App\Model\Domain\Source\Book\Model\BookModel->__construct(Object(App\Entity\Source\BookEntity)) #1 /code/verbanent-legacy/vendor/symfony/http-kernel/HttpKernel.php(150): App\Controller\TextController->quote(1, 'il-lavoro-non-m...', Object(Symfony\Component\HttpFoundation\Request)) #2 /code/verbanent-legacy/vendor/symfony/http-kernel/HttpKernel.php(67): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #3 /code/verbanent-legacy/vendor/symfony/http-kernel/Kernel.php(198): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #4 /code/verbanent-legacy/public/index.php(37): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpF in /code/verbanent-legacy/src/Model/Domain/Source/Book/Model/BookModel.php on line 59