Index: src/system/classes/checkout/CheckoutControl.inc.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/system/classes/checkout/CheckoutControl.inc.php	(date 1431685954000)
+++ src/system/classes/checkout/CheckoutControl.inc.php	(revision )
@@ -121,13 +121,15 @@
 
 						foreach($gm_attributes as $t_options_id => $t_options_values_id)
 						{
-							$gm_attribute_stock = xtc_db_query("SELECT products_attributes_id
-																FROM products_attributes
+							$gm_attribute_stock = xtc_db_query("SELECT a.products_attributes_id
+																FROM products_attributes a
+																LEFT JOIN products_attributes_download AS d ON (a.products_attributes_id = d.products_attributes_id)
 																WHERE
-																	products_id = '" . (int)$gm_attribute_array[0] . "' AND
-																	options_id = '" . (int)$t_options_id . "' AND
-																	options_values_id = '" . (int)$t_options_values_id . "' AND
-																	(attributes_stock - " . (double)$_SESSION['cart']->contents[$products[$i]['id']]['qty'] . ") < 0");
+																	a.products_id = '" . (int)$gm_attribute_array[0] . "' AND
+																	a.options_id = '" . (int)$t_options_id . "' AND
+																	a.options_values_id = '" . (int)$t_options_values_id . "' AND
+																	(a.attributes_stock - " . (double)$_SESSION['cart']->contents[$products[$i]['id']]['qty'] . ") < 0 AND
+																	d.products_attributes_id IS NULL");
 							if(xtc_db_num_rows($gm_attribute_stock) == 1)
 							{
 								$any_out_of_stock = true;