diff --git a/addons/sale/models/sale_order.py b/addons/sale/models/sale_order.py
index feac5f926be..fa0231f321f 100644
--- a/addons/sale/models/sale_order.py
+++ b/addons/sale/models/sale_order.py
@@ -461,7 +461,8 @@ class SaleOrder(models.Model):
     @api.depends('partner_id')
     def _compute_user_id(self):
         for order in self:
-            order.user_id = order.partner_id.user_id or order.partner_id.commercial_partner_id.user_id or self.env.user
+            if not order.user_id:
+                order.user_id = order.partner_id.user_id or order.partner_id.commercial_partner_id.user_id or self.env.user
 
     @api.depends('partner_id', 'user_id')
     def _compute_team_id(self):