diff --git a/src/Customer.php b/src/Customer.php
index 56f2e6e..013eebf 100644
--- a/src/Customer.php
+++ b/src/Customer.php
@@ -113,7 +113,7 @@ public static function findByExternalId($externalId)
             return null;
         }
 
-        return $response->first() || null;
+        return $response->first() ?: null;
     }
 
     /**