diff --git a/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/EntityToJsonTransformer.php b/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/EntityToJsonTransformer.php
index 21f976a0f..20dc7cf06 100644
--- a/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/EntityToJsonTransformer.php
+++ b/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/EntityToJsonTransformer.php
@@ -28,8 +28,8 @@ class EntityToJsonTransformer implements DataTransformerInterface
 
     public function reverseTransform($value)
     {
-        if (false === $this->multiple && '' === $value) {
-            return null;
+        if ($this->multiple && '' === $value) {
+            return [];
         }
 
         if ($this->multiple && [] === $value) {