diff --git a/src/Controller/EntityResource.php b/src/Controller/EntityResource.php
index c788b45..fac71c3 100644
--- a/src/Controller/EntityResource.php
+++ b/src/Controller/EntityResource.php
@@ -340,7 +340,7 @@ class EntityResource {
       ->getDataDefinition()
       ->getFieldStorageDefinition()
       ->isMultiple();
-    if (!$is_multiple) {
+    if (!$is_multiple && $field_list->entity) {
       $response = $this->getIndividual($field_list->entity, $request);
       // Add cacheable metadata for host entity to individual response.
       $response->addCacheableDependency($cacheable_metadata);