diff --git a/contract_sale_invoicing/models/contract.py b/contract_sale_invoicing/models/contract.py
index ca5094e77..8562eb797 100644
--- a/contract_sale_invoicing/models/contract.py
+++ b/contract_sale_invoicing/models/contract.py
@@ -16,16 +16,19 @@ class ContractContract(models.Model):
     @api.multi
     def _recurring_create_invoice(self, date_ref=False):
         invoices = super()._recurring_create_invoice(date_ref)
-        if not self.invoicing_sales:
-            return invoices
-        sales = self.env['sale.order'].search([
-            ('analytic_account_id', '=', self.group_id.id),
-            ('partner_invoice_id', 'child_of',
-             self.partner_id.commercial_partner_id.ids),
-            ('invoice_status', '=', 'to invoice'),
-            ('date_order', '<=',
-             '{} 23:59:59'.format(self.recurring_next_date)),
-        ])
-        if sales:
-            invoice_ids = sales.action_invoice_create()
-            invoices |= self.env['account.invoice'].browse(invoice_ids)[:1]
+        for contract in self:
+            if not contract.invoicing_sales or not contract.recurring_next_date:
+                continue
+            sales = self.env['sale.order'].search([
+                ('analytic_account_id', '=', contract.group_id.id),
+                ('partner_invoice_id', 'child_of',
+                 contract.partner_id.commercial_partner_id.ids),
+                ('invoice_status', '=', 'to invoice'),
+                ('date_order', '<=',
+                 '{} 23:59:59'.format(contract.recurring_next_date)),
+            ])
+            if sales:
+                invoice_ids = sales.action_invoice_create()
+                invoices |= self.env['account.invoice'].browse(invoice_ids)[:1]
+
+        return invoices