diff --git a/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/ObjectToIdTransformer.php b/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/ObjectToIdTransformer.php
index 145ab0441..4122c5509 100644
--- a/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/ObjectToIdTransformer.php
+++ b/src/Bundle/ChillMainBundle/Form/Type/DataTransformer/ObjectToIdTransformer.php
@@ -38,7 +38,7 @@ class ObjectToIdTransformer implements DataTransformerInterface
      */
     public function reverseTransform($id)
     {
-        if (!$id) {
+        if (null === $id) {
             return null;
         }
 
@@ -46,7 +46,7 @@ class ObjectToIdTransformer implements DataTransformerInterface
             ->getRepository($this->class)
             ->find($id);
 
-        if (!$object) {
+        if (null === $object) {
             throw new TransformationFailedException();
         }
 
@@ -62,7 +62,7 @@ class ObjectToIdTransformer implements DataTransformerInterface
      */
     public function transform($object)
     {
-        if (!$object) {
+        if (null === $object) {
             return '';
         }