diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index a2a09b8..3142d05 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -116,7 +116,7 @@ class ValuationBase(ModelSQL):
             if line.purchase.company.currency != currency:
                 with Transaction().set_context(date=Date.today()):
                     base_amount = Currency.compute(currency,amount, line.purchase.company.currency)
-                    rate = round(amount / base_amount,6)
+                    rate = round(amount / (base_amount if base_amount else 1),6)
             last_price = pc.get_last_price()
             # mtm = round(Decimal(last_price) * qty * Decimal(sign), 2) if last_price else Decimal(0)
             values.update({