diff --git a/install/empty_data.php b/install/empty_data.php
index b687dbb2ed8..18d06687d18 100644
--- a/install/empty_data.php
+++ b/install/empty_data.php
@@ -4610,34 +4610,29 @@ public function getEmptyData(): array
                 'id'               => '187',
                 'items_id'         => '1',
                 'type'             => '1',
-                'notifications_id' => '71',
-            ], [
-                'id'               => '188',
-                'items_id'         => '1',
-                'type'             => '1',
                 'notifications_id' => '72',
             ], [
-                'id'               => '189',
+                'id'               => '188',
                 'items_id'         => '1',
                 'type'             => '1',
                 'notifications_id' => '74',
             ], [
-                'id'               => '190',
+                'id'               => '189',
                 'items_id'         => '1',
                 'type'             => '1',
                 'notifications_id' => '75',
             ], [
-                'id'               => '191',
+                'id'               => '190',
                 'items_id'         => '1',
                 'type'             => '1',
                 'notifications_id' => '80',
             ], [
-                'id'               => '192',
+                'id'               => '191',
                 'items_id'         => '1',
                 'type'             => '1',
                 'notifications_id' => '81',
             ], [
-                'id'               => '193',
+                'id'               => '192',
                 'items_id'         => '1',
                 'type'             => '1',
                 'notifications_id' => '82',
diff --git a/install/migrations/update_11.0.5_to_11.0.6.php b/install/migrations/update_11.0.5_to_11.0.6.php
new file mode 100644
index 00000000000..e14cb07638b
--- /dev/null
+++ b/install/migrations/update_11.0.5_to_11.0.6.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * ---------------------------------------------------------------------
+ *
+ * GLPI - Gestionnaire Libre de Parc Informatique
+ *
+ * http://glpi-project.org
+ *
+ * @copyright 2015-2026 Teclib' and contributors.
+ * @licence   https://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * ---------------------------------------------------------------------
+ *
+ * LICENSE
+ *
+ * This file is part of GLPI.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * ---------------------------------------------------------------------
+ */
+
+use function Safe\preg_match;
+use function Safe\scandir;
+
+/**
+ * Update from 11.0.5 to 11.0.6
+ *
+ * @return bool for success (will die for most error)
+ **/
+function update1105to1106()
+{
+    /**
+     * @var DBmysql $DB
+     * @var Migration $migration
+     */
+    global $DB, $migration;
+
+    $updateresult       = true;
+    $ADDTODISPLAYPREF   = [];
+    $DELFROMDISPLAYPREF = [];
+    $update_dir = __DIR__ . '/update_11.0.5_to_11.0.6/';
+
+    $migration->setVersion('11.0.6');
+
+    $update_scripts = scandir($update_dir);
+    foreach ($update_scripts as $update_script) {
+        if (preg_match('/\.php$/', $update_script) !== 1) {
+            continue;
+        }
+        require $update_dir . $update_script;
+    }
+
+    // ************ Keep it at the end **************
+    $migration->updateDisplayPrefs($ADDTODISPLAYPREF, $DELFROMDISPLAYPREF);
+
+    $migration->executeMigration();
+
+    return $updateresult;
+}
diff --git a/install/migrations/update_11.0.5_to_11.0.6/notificationtargets.php b/install/migrations/update_11.0.5_to_11.0.6/notificationtargets.php
new file mode 100644
index 00000000000..1970d51cfba
--- /dev/null
+++ b/install/migrations/update_11.0.5_to_11.0.6/notificationtargets.php
@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * ---------------------------------------------------------------------
+ *
+ * GLPI - Gestionnaire Libre de Parc Informatique
+ *
+ * http://glpi-project.org
+ *
+ * @copyright 2015-2026 Teclib' and contributors.
+ * @licence   https://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * ---------------------------------------------------------------------
+ *
+ * LICENSE
+ *
+ * This file is part of GLPI.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * ---------------------------------------------------------------------
+ */
+
+/**
+ * @var DBmysql $DB
+ * @var Migration $migration
+ */
+
+// Remove duplicates targets
+$duplicates_targets_iterator = $DB->request([
+    'SELECT' => [
+        'notifications_id',
+        'items_id',
+        'type',
+        'MIN' => 'id AS min_id',
+        'COUNT' => '* AS count',
+    ],
+    'FROM' => 'glpi_notificationtargets',
+    'GROUPBY' => ['notifications_id', 'items_id', 'type'],
+    'HAVING' => ['count' => ['>', 1]],
+]);
+
+foreach ($duplicates_targets_iterator as $target) {
+    $DB->delete('glpi_notificationtargets', [
+        'notifications_id' => $target['notifications_id'],
+        'items_id' => $target['items_id'],
+        'type' => $target['type'],
+        'id' => ['>', $target['min_id']],
+    ]);
+}
+
+$migration->dropKey('glpi_notificationtargets', 'notifications_id');
+$migration->addKey('glpi_notificationtargets', ['notifications_id', 'items_id', 'type'], 'unicity', 'UNIQUE');
diff --git a/install/mysql/glpi-empty.sql b/install/mysql/glpi-empty.sql
index 4521f392153..1d6e4f73d13 100644
--- a/install/mysql/glpi-empty.sql
+++ b/install/mysql/glpi-empty.sql
@@ -5075,8 +5075,8 @@ CREATE TABLE `glpi_notificationtargets` (
   `notifications_id` int unsigned NOT NULL DEFAULT '0',
   `is_exclusion` tinyint NOT NULL DEFAULT '0',
   PRIMARY KEY (`id`),
+  UNIQUE KEY `unicity` (`notifications_id`,`items_id`,`type`),
   KEY `items` (`type`,`items_id`),
-  KEY `notifications_id` (`notifications_id`),
   KEY `is_exclusion` (`is_exclusion`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC;