diff --git a/modules/jsonapi/src/Controller/EntityResource.php b/modules/jsonapi/src/Controller/EntityResource.php
index e64adf74..9a7e0cfe 100644
--- a/modules/jsonapi/src/Controller/EntityResource.php
+++ b/modules/jsonapi/src/Controller/EntityResource.php
@@ -181,7 +181,7 @@ class EntityResource {
    *   The JSON:API entity access checker.
    * @param \Drupal\jsonapi\Context\FieldResolver $field_resolver
    *   The JSON:API field resolver.
-   * @param \Symfony\Component\Serializer\SerializerInterface $serializer
+   * @param \Symfony\Component\Serializer\SerializerInterface|\Symfony\Component\Serializer\Normalizer\DenormalizerInterface $serializer
    *   The JSON:API serializer.
    * @param \Drupal\Component\Datetime\TimeInterface $time
    *   The time service.
@@ -202,7 +202,7 @@ class EntityResource {
     $this->serializer = $serializer;
     $this->time = $time;
     $this->user = $user;
-    if (!$language_manager) {
+    if ($language_manager === NULL) {
       @trigger_error('The language_manager service must be passed to ' . __NAMESPACE__ . '\EntityResource::__construct(). It was added in drupal:10.1.x and will be required before drupal:11.0.0. See https://www.drupal.org/node/3357049', E_USER_DEPRECATED);
       $language_manager = \Drupal::service('language_manager');
     }