diff --git a/Models/EditorDoc.php b/Models/EditorDoc.php
index 5a032f1..c9c85d2 100644
--- a/Models/EditorDoc.php
+++ b/Models/EditorDoc.php
@@ -235,7 +235,7 @@ class EditorDoc implements ArrayableInterface, \JsonSerializable
 
     public function __toString()
     {
-        return \json_encode($this->toArray());
+        return (string) \json_encode($this->toArray());
     }
 
     public function jsonSerialize()