diff --git a/MEMORY.md b/MEMORY.md
index c073388..2aa2aad 100644
--- a/MEMORY.md
+++ b/MEMORY.md
@@ -61,6 +61,23 @@ In una nuova installazione del plugin, i campi "API username" e "API password" n
 1. **`Server.php::showFormFields()`** — Sostituito `$canUpdate` con `$canEdit`: per nuovi server (`$ID <= 0`) usa `CREATE`, per server esistenti usa `UPDATE`.
 2. **`Profile.php::installRights()`** — In assenza di sessione attiva (CLI), cerca il profilo "Super-Admin" tramite query diretta e gli assegna tutti i diritti.
 
+## Bugfix: Unknown column 'users_id' — Group::getDataItems() SQL error
+
+### Problema
+Su server produttivo, `Group::showItems()` generava un errore MySQL 1054 (Unknown column 'users_id') quando GLPI iterava sugli itemtype registrati con `linkgroup_types => true`. La query includeva:
+```sql
+WHERE ((... ) OR (`users_id` IN (SELECT `users_id` FROM `glpi_groups_users` WHERE `groups_id` IN ('7483'))))
+```
+La colonna `users_id` non esisteva nella tabella `glpi_plugin_urbackup_servers`.
+
+### Causa
+`Server` è registrato in `setup.php:57` con `linkgroup_types => true`, il che fa sì che GLPI lo includa nelle query di `Group::getDataItems()`. Il metodo aggiunge automaticamente una condizione `users_id IN (...)` assumendo che ogni itemtype abbia tale colonna.
+
+### Fix
+1. **`install/mysql/plugin_urbackup-empty.sql`** — Aggiunta colonna `users_id INT UNSIGNED NOT NULL DEFAULT 0` dopo `locations_id` + indice
+2. **`install/install.php`** — Aggiunto `$migration->addField('users_id', ...)` e `$migration->addKey('users_id')` nella migrazione del server
+3. **`src/Server.php`** — Aggiunto search option `id=8` per `User::getTable()` + auto-set di `users_id` da `$_SESSION['glpiID']` in `prepareInputForAdd()`
+
 ## Versione
 - 0.7.0
 
diff --git a/install/install.php b/install/install.php
index 1f3d7c3..9a29004 100644
--- a/install/install.php
+++ b/install/install.php
@@ -202,6 +202,11 @@ function plugin_urbackup_install_update_servers_table(Migration $migration): voi
         'after' => 'name',
     ]);
 
+    $migration->addField($table, 'users_id', 'integer', [
+        'value' => 0,
+        'after' => 'locations_id',
+    ]);
+
     $migration->addField($table, 'ip_address', 'string', [
         'value' => '',
         'after' => 'locations_id',
@@ -262,6 +267,7 @@ function plugin_urbackup_install_update_servers_table(Migration $migration): voi
     $migration->addKey($table, 'name');
     $migration->addKey($table, 'entities_id');
     $migration->addKey($table, 'locations_id');
+    $migration->addKey($table, 'users_id');
     $migration->addKey($table, 'is_active');
     $migration->addKey($table, ['locations_id', 'is_active'], 'location_active');
 }
diff --git a/install/mysql/plugin_urbackup-empty.sql b/install/mysql/plugin_urbackup-empty.sql
index ff173f3..2889e46 100644
--- a/install/mysql/plugin_urbackup-empty.sql
+++ b/install/mysql/plugin_urbackup-empty.sql
@@ -14,6 +14,7 @@ CREATE TABLE IF NOT EXISTS `glpi_plugin_urbackup_servers` (
   `is_recursive` TINYINT NOT NULL DEFAULT 0,
   `name` VARCHAR(255) NOT NULL DEFAULT '',
   `locations_id` INT UNSIGNED NOT NULL DEFAULT 0,
+  `users_id` INT UNSIGNED NOT NULL DEFAULT 0,
   `ip_address` VARCHAR(255) NOT NULL DEFAULT '',
   `port` INT UNSIGNED NOT NULL DEFAULT 55414,
   `protocol` VARCHAR(10) NOT NULL DEFAULT 'http',
@@ -32,6 +33,7 @@ CREATE TABLE IF NOT EXISTS `glpi_plugin_urbackup_servers` (
   KEY `name` (`name`),
   KEY `entities_id` (`entities_id`),
   KEY `locations_id` (`locations_id`),
+  KEY `users_id` (`users_id`),
   KEY `is_active` (`is_active`),
   KEY `location_active` (`locations_id`, `is_active`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC;
diff --git a/src/Server.php b/src/Server.php
index ebd3375..3daaa72 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -259,6 +259,14 @@ class Server extends CommonDBTM
 
         $tab[] = [
             'id'       => 8,
+            'table'    => User::getTable(),
+            'field'    => 'name',
+            'name'     => User::getTypeName(1),
+            'datatype' => 'dropdown',
+        ];
+
+        $tab[] = [
+            'id'       => 9,
             'table'    => self::getTable(),
             'field'    => 'is_active',
             'name'     => __('Active'),
@@ -266,7 +274,7 @@ class Server extends CommonDBTM
         ];
 
         $tab[] = [
-            'id'       => 9,
+            'id'       => 10,
             'table'    => self::getTable(),
             'field'    => 'last_api_status',
             'name'     => __('Last API status', 'urbackup'),
@@ -274,7 +282,7 @@ class Server extends CommonDBTM
         ];
 
         $tab[] = [
-            'id'       => 10,
+            'id'       => 11,
             'table'    => self::getTable(),
             'field'    => 'last_api_check',
             'name'     => __('Last API check', 'urbackup'),
@@ -282,7 +290,7 @@ class Server extends CommonDBTM
         ];
 
         $tab[] = [
-            'id'       => 11,
+            'id'       => 12,
             'table'    => self::getTable(),
             'field'    => 'date_creation',
             'name'     => __('Creation date'),
@@ -290,7 +298,7 @@ class Server extends CommonDBTM
         ];
 
         $tab[] = [
-            'id'       => 12,
+            'id'       => 13,
             'table'    => self::getTable(),
             'field'    => 'date_mod',
             'name'     => __('Last update'),
@@ -299,7 +307,7 @@ class Server extends CommonDBTM
 
         if (Session::haveRight(self::$rightname, UPDATE)) {
             $tab[] = [
-                'id'        => 13,
+                'id'        => 14,
                 'table'     => self::getTable(),
                 'field'     => 'id',
                 'name'      => __('View', 'urbackup'),
@@ -571,6 +579,10 @@ class Server extends CommonDBTM
             return $input;
         }
 
+        if (!isset($input['users_id']) || $input['users_id'] <= 0) {
+            $input['users_id'] = (int) ($_SESSION['glpiID'] ?? 0);
+        }
+
         if (!isset($input['port']) || $input['port'] === '' || $input['port'] === null) {
             $input['port'] = 55414;
         }