diff --git a/src/Plugin/facets/processor/ListItemProcessor.php b/src/Plugin/facets/processor/ListItemProcessor.php
index 44085fc..12516c3 100644
--- a/src/Plugin/facets/processor/ListItemProcessor.php
+++ b/src/Plugin/facets/processor/ListItemProcessor.php
@@ -79,16 +79,15 @@ class ListItemProcessor extends ProcessorPluginBase implements BuildProcessorInt
     }
 
     // If it's an entity base field, we find it in the field definitions.
-    // Unfortunately we don't have access to the bundle via SearchApiFacetSourceInterface,
-    // so we check the entity's base fields only.
-    $baseFields = $this->entityFieldManager->getFieldDefinitions($entity, '');
+    // We don't have access to the bundle via SearchApiFacetSourceInterface, so
+    // we check the entity's base fields only.
+    $base_fields = $this->entityFieldManager->getFieldDefinitions($entity, '');
 
-    // If it's a field.module field we can look it up this way:
+    // This only works for configurable fields.
     $config_entity_name = sprintf('field.storage.%s.%s', $entity, $field_identifier);
 
-    // Is this a base field, or a field.module field?
-    if (isset($baseFields[$field_identifier])) {
-      $field = $baseFields[$field_identifier];
+    if (isset($base_fields[$field_identifier])) {
+      $field = $base_fields[$field_identifier];
     }
     elseif ($this->configManager->loadConfigEntityByName($config_entity_name) !== NULL) {
       $field = $this->configManager->loadConfigEntityByName($config_entity_name);