diff --git a/addons/hr_holidays/models/res_users.py b/addons/hr_holidays/models/res_users.py
index a68c49e5c44..20ad6cc66cb 100644
--- a/addons/hr_holidays/models/res_users.py
+++ b/addons/hr_holidays/models/res_users.py
@@ -70,8 +70,10 @@ class User(models.Model):
             ['leave_manager_id'],
             ['leave_manager_id'])
         responsibles_to_remove_ids = set(self.ids) - {x['leave_manager_id'][0] for x in res}
-        approver_group.write({
-            'users': [(3, manager_id) for manager_id in responsibles_to_remove_ids]})
+        if responsibles_to_remove_ids:
+            approver_group.write({
+                'users': [(3, manager_id) for manager_id in responsibles_to_remove_ids]
+            })
 
     @api.model_create_multi
     def create(self, vals_list):