Drupal\bibcite_ris\Encoder\RISEncoder->buildEntry() (Line: 190) Drupal\bibcite_ris\Encoder\RISEncoder->{closure:Drupal\bibcite_ris\Encoder\RISEncoder::encode():189}() array_map() (Line: 189) Drupal\bibcite_ris\Encoder\RISEncoder->encode() (Line: 43) Symfony\Component\Serializer\Encoder\ChainEncoder->encode() (Line: 383) Symfony\Component\Serializer\Serializer->encode() (Line: 134) Symfony\Component\Serializer\Serializer->serialize() (Line: 75) Drupal\bibcite_export\Controller\ExportController->processExport() (Line: 113) Drupal\bibcite_export\Controller\ExportController->export() call_user_func_array() (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::wrapControllerExecutionInRenderContext():121}() (Line: 634) Drupal\Core\Render\Renderer::{closure:Drupal\Core\Render\Renderer::executeInRenderContext():634}() Fiber->start() (Line: 635) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 121) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::onController():96}() (Line: 183) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 53) Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 54) Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 745) Drupal\Core\DrupalKernel->handle() (Line: 19)