I'm using the mod Big Chooser by That Software Guy and can't get it to work with this mod. When I upload the orders.php file that comes with this mod, I get the same warning everyone else does about the shipping address (because 99.9% of my products are virtual), so I would like to have that removed. But when I click update, I get a 500 server error. Checking my logs, this is the error I get:

[29-Jan-2016 18:51:21 America/New_York] PHP Warning: array_key_exists() expects parameter 2 to be array, boolean given in /includes/functions/extra_functions/edit_orders_functions.php on line 1409

[29-Jan-2016 18:51:21 America/New_York] PHP Warning: array_key_exists() expects parameter 2 to be array, boolean given in /includes/functions/extra_functions/edit_orders_functions.php on line 1409

[29-Jan-2016 18:51:21 America/New_York] PHP Fatal error: Call to undefined function zen_get_products_manufacturers_id() in /includes/modules/order_total/ot_big_chooser.php on line 942