Slim Application Error

The application could not run because of the following error:

Details

Type: Error
Message: Call to a member function eventDate() on bool
File: /var/klenkes/frontend-prod/classes/Model/Article.php
Line: 18

Trace

#0 /var/klenkes/frontend-prod/classes/Model/Base.php(63): Klenkes\Model\Article::get()
#1 /var/klenkes/frontend-prod/classes/Controller/PageController.php(66): Klenkes\Model\Base::getData()
#2 /var/klenkes/frontend-prod/classes/Controller/PageController.php(29): Klenkes\Controller\PageController->getDataFromSource()
#3 /var/klenkes/frontend-prod/classes/Routing.php(72): Klenkes\Controller\PageController->__construct()
#4 [internal function]: Klenkes\Routing->Klenkes\{closure}()
#5 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(40): call_user_func()
#6 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/Route.php(281): Slim\Handlers\Strategies\RequestResponse->__invoke()
#7 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\Route->__invoke()
#8 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/Route.php(268): Slim\Route->callMiddlewareStack()
#9 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/App.php(503): Slim\Route->run()
#10 /var/klenkes/frontend-prod/www/index.php(10): Slim\App->__invoke()
#11 [internal function]: Closure->{closure}()
#12 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()
#13 [internal function]: Slim\DeferredCallable->__invoke()
#14 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()
#15 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim\{closure}()
#16 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/App.php(392): Slim\App->callMiddlewareStack()
#17 /var/klenkes/frontend-prod/vendor/slim/slim/Slim/App.php(297): Slim\App->process()
#18 /var/klenkes/frontend-prod/www/index.php(26): Slim\App->run()
#19 {main}