diff --git a/addons/product_visible_discount/product_visible_discount.py b/addons/product_visible_discount/product_visible_discount.py
index 275bfcd68b1..6ce35a741e2 100644
--- a/addons/product_visible_discount/product_visible_discount.py
+++ b/addons/product_visible_discount/product_visible_discount.py
@@ -74,7 +74,7 @@ class sale_order_line(osv.osv):
         result=res['value']
         pricelist_obj=self.pool.get('product.pricelist')
         product_obj = self.pool.get('product.product')
-        if product:
+        if product and pricelist:
             if result.get('price_unit',False):
                 price=result['price_unit']
             else:
@@ -88,7 +88,7 @@ class sale_order_line(osv.osv):
 
             new_list_price = get_real_price(list_price, product.id, qty, uom, pricelist)
             if so_pricelist.visible_discount and list_price[pricelist] != 0 and new_list_price != 0:
-                if so_pricelist.currency_id.id != product.company_id.currency_id.id:
+                if product.company_id and so_pricelist.currency_id.id != product.company_id.currency_id.id:
                     # new_list_price is in company's currency while price in pricelist currency
                     new_list_price = self.pool['res.currency'].compute(cr, uid,
                         product.company_id.currency_id.id, so_pricelist.currency_id.id,
@@ -101,4 +101,6 @@ class sale_order_line(osv.osv):
                     result['discount'] = 0.0
             else:
                 result['discount'] = 0.0
+        else:
+            result['discount'] = 0.0
         return res