I've been using ZC for quite a while, and have been using Edit Orders as a staple add-on.
At first I thought this might be related to rewards points, but after installing both the latest version of Rewards Points 2.5e and Edit order 4.1.4. Im beginning to think it's something else.

While editing an order, changing, updating any user information, adding products, or no change made at all, edit order will throw an error of the following after pressing the "update" button:
WARNING: An Error occurred, please refresh the page and try again.

If it's editing user information or adding a product, refreshing the order page will show the changes even after the error will show the changes.
However, trying to delete a product from an order, will throw the same error, but does not actually remove the product from the order.

Debug file shows this:
[01-Oct-2015 23:31:19 America/Los_Angeles] PHP Fatal error: 1054:Unknown column 'p.products_quantity' in 'field list' :: SELECT `p`.`products_quantity` FROM `products` WHERE `p`.`products_id` = '5646' ==> (as called by) /home/webuser/shopping/someadmin/includes/functions/extra_functions/edit_orders_functions.php on line 1028 <== in /home/webuser/shopping/includes/classes/db/mysql/query_factory.php on line 155

My configuration is the following:
Zen-Cart v1.5.4 Database Patch Level: 1.5.4 (From Server_info.php)
Edit Order 4.1.4
Reward Points 2.5e
Centos 6 Linux 2.6.32-504.23.4.el6.x86_64
MySQL 5.6.23-log (AWS RDS)
Apache/2.2.15
PHP 5.6.10

I can't seem to figure what's causing this, and kinda stumped on how to go about fixing it. Any insight would be most appreciated!