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Error: Call to a member function get() on null in Drupal\custom_events\Controller\CartController->addToCart() (line 59 of modules/custom_events/src/Controller/CartController.php).
Drupal\custom_events\Controller\CartController->addToCart() call_user_func_array() (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 582) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 57) Drupal\Core\StackMiddleware\Session->handle() (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 184) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 121) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 75) Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 50) Drupal\ban\BanMiddleware->handle() (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23) Stack\StackedHttpKernel->handle() (Line: 666) Drupal\Core\DrupalKernel->handle() (Line: 19)