diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96342acb..ad8a0dc6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+- Fix `add` operations when a linked object already exists before the plugin container fields are created.
+
 ### Fixed
 
 - Fix left side menu url (with `DIR_MARKETPLACE`)
diff --git a/inc/container.class.php b/inc/container.class.php
index f0febac9..16d249c5 100644
--- a/inc/container.class.php
+++ b/inc/container.class.php
@@ -1780,6 +1780,7 @@ public static function preItemUpdate(CommonDBTM $item)
         self::preItem($item);
         if (array_key_exists('_plugin_fields_data', $item->input)) {
             $data = $item->input['_plugin_fields_data'];
+            $data['itemtype'] = $item::class;
             $data['entities_id'] = $item->isEntityAssign() ? $item->getEntityID() : 0;
             //update data
             $container = new self();