diff --git a/modules/purchase_trade/lot.py b/modules/purchase_trade/lot.py
index c35d076..d0a2fa6 100755
--- a/modules/purchase_trade/lot.py
+++ b/modules/purchase_trade/lot.py
@@ -3385,7 +3385,7 @@ class ContractDetail(ModelView):
         if lqt and lqt.lot_p and getattr(lqt.lot_p.line.purchase, 'crop', None):
             return lqt.lot_p.line.purchase.crop.id
         if lqt and lqt.lot_s and getattr(lqt.lot_s.sale_line.sale, 'crop', None):
-            return lqt.lot_s.line.sale.crop.id
+            return lqt.lot_s.sale_line.sale.crop.id
 
     @classmethod
     def default_currency(cls):