Slim Application Error

The application could not run because of the following error:

Details

Type: Twig_Error_Runtime
Message: Impossible to access an attribute ("slug") on a null variable.
File: /home/carlos1q/resources/views/page-drawing-detail.twig
Line: 1

Trace

#0 /home/carlos1q/vendor/twig/twig/lib/Twig/Environment.php(378) : eval()'d code(39): twig_get_attribute(Object(Twig_Environment), Object(Twig_Source), NULL, 'slug', Array)
#1 /home/carlos1q/vendor/twig/twig/lib/Twig/Template.php(189): __TwigTemplate_cb44111b638e77a4522c5f84aa9b8ae417c8f255e6ccbde012f89e4f0798bbc5->block_page(Array, Array)
#2 /home/carlos1q/vendor/twig/twig/lib/Twig/Environment.php(378) : eval()'d code(31): Twig_Template->displayBlock('page', Array, Array)
#3 /home/carlos1q/vendor/twig/twig/lib/Twig/Template.php(390): __TwigTemplate_c68f76ddf13603796f8bf08c254c78ea9d992f0da41a3dbf08cfe73feefb8051->doDisplay(Array, Array)
#4 /home/carlos1q/vendor/twig/twig/lib/Twig/Template.php(367): Twig_Template->displayWithErrorHandling(Array, Array)
#5 /home/carlos1q/vendor/twig/twig/lib/Twig/Environment.php(378) : eval()'d code(29): Twig_Template->display(Array, Array)
#6 /home/carlos1q/vendor/twig/twig/lib/Twig/Template.php(390): __TwigTemplate_cb44111b638e77a4522c5f84aa9b8ae417c8f255e6ccbde012f89e4f0798bbc5->doDisplay(Array, Array)
#7 /home/carlos1q/vendor/twig/twig/lib/Twig/Template.php(367): Twig_Template->displayWithErrorHandling(Array, Array)
#8 /home/carlos1q/vendor/twig/twig/lib/Twig/Template.php(375): Twig_Template->display(Array)
#9 /home/carlos1q/vendor/twig/twig/lib/Twig/Environment.php(289): Twig_Template->render(Array)
#10 /home/carlos1q/vendor/slim/twig-view/src/Twig.php(88): Twig_Environment->render('page-drawing-de...', Array)
#11 /home/carlos1q/vendor/slim/twig-view/src/Twig.php(132): Slim\Views\Twig->fetch('page-drawing-de...', Array)
#12 /home/carlos1q/src/app/Controller/PageController.php(108): Slim\Views\Twig->render(Object(Slim\Http\Response), 'page-drawing-de...', Array)
#13 /home/carlos1q/src/app/routes.php(35): App\Controller\PageController->renderDrawingDetail(Object(Slim\Http\Request), Object(Slim\Http\Response), Array, 'en', 'gallery')
#14 [internal function]: Closure->{closure}(Object(Slim\Http\Request), Object(Slim\Http\Response), Array)
#15 /home/carlos1q/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(41): call_user_func(Object(Closure), Object(Slim\Http\Request), Object(Slim\Http\Response), Array)
#16 /home/carlos1q/vendor/slim/slim/Slim/Route.php(335): Slim\Handlers\Strategies\RequestResponse->__invoke(Object(Closure), Object(Slim\Http\Request), Object(Slim\Http\Response), Array)
#17 /home/carlos1q/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\Route->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response))
#18 /home/carlos1q/vendor/slim/slim/Slim/Route.php(313): Slim\Route->callMiddlewareStack(Object(Slim\Http\Request), Object(Slim\Http\Response))
#19 /home/carlos1q/vendor/slim/slim/Slim/App.php(513): Slim\Route->run(Object(Slim\Http\Request), Object(Slim\Http\Response))
#20 /home/carlos1q/src/app/middleware.php(96): Slim\App->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response))
#21 [internal function]: Closure->{closure}(Object(Slim\Http\Request), Object(Slim\Http\Response), Object(Slim\App))
#22 /home/carlos1q/vendor/slim/slim/Slim/DeferredCallable.php(43): call_user_func_array(Object(Closure), Array)
#23 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response), Object(Slim\App))
#24 /home/carlos1q/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(Slim\Http\Response), Object(Slim\App))
#25 /home/carlos1q/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(Slim\Http\Response))
#26 /home/carlos1q/vendor/slim/slim/Slim/App.php(406): Slim\App->callMiddlewareStack(Object(Slim\Http\Request), Object(Slim\Http\Response))
#27 /home/carlos1q/vendor/slim/slim/Slim/App.php(314): Slim\App->process(Object(Slim\Http\Request), Object(Slim\Http\Response))
#28 /home/carlos1q/public_html/index.php(38): Slim\App->run()
#29 {main}