diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9f72b469..ec47315d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -110,3 +110,5 @@ Master branch
 =============
 
 - [translation] in french, replace "Modifier" by "Enregistrer" in the edit form
+- [chill entity render] fix error when fallback to default entity render (usage of __toString())
+
diff --git a/Templating/Entity/ChillEntityRender.php b/Templating/Entity/ChillEntityRender.php
index fec14a594..8f8f58263 100644
--- a/Templating/Entity/ChillEntityRender.php
+++ b/Templating/Entity/ChillEntityRender.php
@@ -33,7 +33,7 @@ class ChillEntityRender extends AbstractChillEntityRender
 
     public function renderString($entity, array $options): string
     {
-        return $entity;
+        return (string) $entity;
     }
 
     public function supports($entity, array $options): bool
diff --git a/Templating/Entity/ChillEntityRenderExtension.php b/Templating/Entity/ChillEntityRenderExtension.php
index 98cb90ee5..23a90240f 100644
--- a/Templating/Entity/ChillEntityRenderExtension.php
+++ b/Templating/Entity/ChillEntityRenderExtension.php
@@ -41,6 +41,11 @@ class ChillEntityRenderExtension extends AbstractExtension
      */
     protected $defaultRender;
     
+    public function __construct()
+    {
+        $this->defaultRender = new ChillEntityRender();
+    }
+    
     public function getFilters()
     {
         return [
@@ -55,12 +60,20 @@ class ChillEntityRenderExtension extends AbstractExtension
     
     public function renderString($entity, array $options = []): string
     {
+        if (NULL === $entity) {
+            return '';
+        }
+        
         return $this->getRender($entity, $options)
             ->renderString($entity, $options);
     }
     
     public function renderBox($entity, array $options = []): string
     {
+        if (NULL === $entity) {
+            return '';
+        }
+        
         return $this->getRender($entity, $options)
             ->renderBox($entity, $options);
     }