diff --git a/sale.py b/sale.py
index d06b533377..0c29465770 100644
--- a/sale.py
+++ b/sale.py
@@ -1377,6 +1377,8 @@ class SaleLine(ModelSQL, ModelView):
         ignored_ids = set(
             l.id for i in line.sale.invoices_ignored for l in i.lines)
         for invoice_line in line.invoice_lines:
+            if invoice_line.type != 'line':
+                continue
             if ((invoice_line.invoice and
                     invoice_line.invoice.state != 'cancel') or
                 invoice_line.id in ignored_ids):