diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 52c7f346734..7e6f9bdf20e 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -1448,7 +1448,7 @@ class AccountInvoiceLine(models.Model):
         if self.invoice_id.currency_id and self.invoice_id.currency_id != self.invoice_id.company_id.currency_id:
             currency = self.invoice_id.currency_id
             date = self.invoice_id._get_currency_rate_date()
-            price_subtotal_signed = currency._convert(price_subtotal_signed, self.invoice_id.company_id.currency_id, self.company_id, date or fields.Date.today())
+            price_subtotal_signed = currency._convert(price_subtotal_signed, self.invoice_id.company_id.currency_id, self.company_id or self.env.user.company_id, date or fields.Date.today())
         sign = self.invoice_id.type in ['in_refund', 'out_refund'] and -1 or 1
         self.price_subtotal_signed = price_subtotal_signed * sign