diff --git a/addons/point_of_sale/models/res_config_settings.py b/addons/point_of_sale/models/res_config_settings.py
index 04efa987915..09d5325acb8 100644
--- a/addons/point_of_sale/models/res_config_settings.py
+++ b/addons/point_of_sale/models/res_config_settings.py
@@ -173,7 +173,7 @@ class ResConfigSettings(models.TransientModel):
 
     def pos_open_ui(self):
         if self._context.get('pos_config_id'):
-            pos_config_id = self._context['pos_config_id'][0]
+            pos_config_id = self._context['pos_config_id']
             pos_config = self.env['pos.config'].browse(pos_config_id)
             return pos_config.open_ui()