diff --git a/addons/purchase_stock/models/account_invoice.py b/addons/purchase_stock/models/account_invoice.py
index eecbd1f8a90..4b8f633f9a1 100644
--- a/addons/purchase_stock/models/account_invoice.py
+++ b/addons/purchase_stock/models/account_invoice.py
@@ -101,7 +101,7 @@ class AccountInvoice(models.Model):
                     tax_ids = []
                     if line['tax_ids']:
                         #line['tax_ids'] is -2many commands list for account.move.line
-                        tax_ids = [tax_data[id] for tax_data in self.env['account.move.line'].resolve_2many_commands('tax_ids', line['tax_ids'], ['id'])]
+                        tax_ids = [tax_data['id'] for tax_data in self.env['account.move.line'].resolve_2many_commands('tax_ids', line['tax_ids'], ['id'])]
                         taxes = self.env['account.tax'].browse(tax_ids)
                         price_unit = taxes.compute_all(price_unit, currency=inv.currency_id, quantity=1.0, is_refund=inv.type in ('in_refund', 'out_refund'))['total_excluded']