diff -u b/src/Plugin/migrate/process/EntityLookup.php b/src/Plugin/migrate/process/EntityLookup.php
--- b/src/Plugin/migrate/process/EntityLookup.php
+++ b/src/Plugin/migrate/process/EntityLookup.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Entity\EntityReferenceSelection\SelectionPluginManagerInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
-use Drupal\migrate\Entity\MigrationInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
 use Drupal\migrate\MigrateException;
 use Drupal\migrate\MigrateExecutableInterface;
 use Drupal\migrate\ProcessPluginBase;
@@ -24,7 +24,7 @@
  *   id = "entity_lookup"
  * )
  *
- * In it's most simple form, this plugin needs no configuration. However, if the
+ * In its most simple form, this plugin needs no configuration. However, if the
  * lookup properties cannot be determined through introspection, define them via
  * configuration.
  *
@@ -58,10 +58,10 @@
   /** @var \Drupal\Core\Entity\EntityManagerInterface */
   protected $entityManager;
 
-  /** @var \Drupal\migrate\Entity\MigrationInterface */
+  /** @var \Drupal\migrate\Plugin\MigrationInterface */
   protected $migration;
 
-  /** @var Drupal\Core\Entity\EntityReferenceSelection\SelectionPluginManagerInterface */
+  /** @var \Drupal\Core\Entity\EntityReferenceSelection\SelectionPluginManagerInterface */
   protected $selectionPluginManager;
 
   /** @var string */
@@ -186,8 +186,8 @@
    * @param $value
    * The value to query.
    *
-   * @return mixed|bool
-   *   Entity id if the queried entity exists. Otherwise FALSE.
+   * @return mixed|null
+   *   Entity id if the queried entity exists. Otherwise NULL.
    */
   protected function query($value) {
     // Entity queries typically are case-insensitive. Therefore, we need to
@@ -204,6 +204,10 @@
     }
     $results = $query->execute();
 
+    if (empty($results)) {
+      return NULL;
+    }
+
     // By default do a case-sensitive comparison.
     if (!$ignoreCase) {
       // Returns the entity's identifier.