diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index 78060e8a733..b1e8e8ecb08 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -884,11 +884,11 @@ class account_voucher(osv.osv):
         else:
             currency_id = journal.company_id.currency_id.id
 
-        period_id = self.pool['account.period'].find(cr, uid, context=dict(context, company_id=company_id))
+        period_ids = self.pool['account.period'].find(cr, uid, context=dict(context, company_id=company_id))
         vals['value'].update({
             'currency_id': currency_id,
             'payment_rate_currency_id': currency_id,
-            'period_id' : period_id
+            'period_id': period_ids and period_ids[0] or False
         })
         #in case we want to register the payment directly from an invoice, it's confusing to allow to switch the journal 
         #without seeing that the amount is expressed in the journal currency, and not in the invoice currency. So to avoid