diff --git a/composer.json b/composer.json
index a985fc6..f5ac8cd 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "6dreams/rich-model-trait",
     "description": "A rich replacement for your anemic getters and setters",
-    "version": "0.6.4",
+    "version": "0.6.5",
     "type": "library",
     "license": "MIT",
     "authors": [
diff --git a/src/SixDreams/RichModel/Traits/RichModelTrait.php b/src/SixDreams/RichModel/Traits/RichModelTrait.php
index 55b97a0..640bdee 100644
--- a/src/SixDreams/RichModel/Traits/RichModelTrait.php
+++ b/src/SixDreams/RichModel/Traits/RichModelTrait.php
@@ -190,9 +190,12 @@ public function __call($name, array $arguments = [])
      * {@inheritdoc}
      *
      * @return array
+     *
+     * @throws RichModelFieldException
      */
     public function __sleep()
     {
+        $this->initRichModelUtils();
         return (array) \array_reduce(
             $this->richClassReflection->getProperties(),
             function (array $items, \ReflectionProperty $property) {