diff --git a/account.py b/account.py
index 0816fe3..84795f3 100644
--- a/account.py
+++ b/account.py
@@ -38,7 +38,7 @@ class SaleAccountMoves(Wizard):
             'start_date': self.start.start_date,
             'end_date': self.start.end_date,
             'shop': self.start.shop.id,
-            'party': self.start.party.id
+            'party': self.start.party.id if self.start.party else None
         }
         return action, data