diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index faea6ec..c5e7be5 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -331,7 +331,8 @@ class ValuationBase(ModelSQL):
         Date = Pool().get('ir.date')
         Valuation = Pool().get('valuation.valuation')
         ValuationLine = Pool().get('valuation.valuation.line')
-
+        if not line:
+            pass
         Valuation.delete(Valuation.search([
             ('line', '=', line.id),
             ('date', '=', Date.today()),