diff --git a/src/Drupal/Driver/Fields/Drupal8/EntityReferenceHandler.php b/src/Drupal/Driver/Fields/Drupal8/EntityReferenceHandler.php
index 0552b6fe..e2c8fc3f 100644
--- a/src/Drupal/Driver/Fields/Drupal8/EntityReferenceHandler.php
+++ b/src/Drupal/Driver/Fields/Drupal8/EntityReferenceHandler.php
@@ -14,7 +14,15 @@ public function expand($values) {
     $return = array();
     $entity_type_id = $this->fieldInfo->getSetting('target_type');
     $entity_definition = \Drupal::entityManager()->getDefinition($entity_type_id);
-    $label_key = $entity_definition->getKey('label');
+
+    // Determine label field key.
+    if ($entity_type_id !== 'user') {
+      $label_key = $entity_definition->getKey('label');
+    }
+    else {
+      // Entity Definition->getKey('label') returns false for users.
+      $label_key = 'name';
+    }
 
     // Determine target bundle restrictions.
     $target_bundle_key = NULL;