diff --git a/web/modules/custom/geo_citation/geo_citation.module b/web/modules/custom/geo_citation/geo_citation.module
index 8c5f3e8..740eb8a 100644
--- a/web/modules/custom/geo_citation/geo_citation.module
+++ b/web/modules/custom/geo_citation/geo_citation.module
@@ -75,7 +75,7 @@ function geo_citation_pseudo_field($entity) {
     return $markup;
   }
 
-  $authors = $entity->field_authors->entity->title->value;
+  $authors = isset($entity->field_authors->entity) ? $entity->field_authors->entity->title->value : '';
   $date = $entity->field_publication_date->value;
   $year = substr($date, 0, 4);
   $title = $entity->title->value;