diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02799630..52ff0022 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fix default value format for multiple dropdown (GLPIObject)
+- Fix bad SQL query for `GenericObject`
 - Fixed a bug that prevented the creation of additional field data for objects
 - Hide config menu if user does not have read permission
 
diff --git a/inc/field.class.php b/inc/field.class.php
index efaa97a6..7c7a2cf2 100644
--- a/inc/field.class.php
+++ b/inc/field.class.php
@@ -252,7 +252,7 @@ public function prepareInputForAdd($input)
         $input['name'] = $this->prepareName($input);
 
         if ($input['multiple'] ?? false) {
-            $input['default_value'] = json_encode($input['default_value'] ?? []);
+            $input['default_value'] = json_encode($input['default_value'] ?: []);
         }
 
         //reject adding when field name is too long for mysql