osCommerce: Add-On Syntax Error

I'm getting a "1064 - You have an error in your SQL syntax..." error when attempting to access the discount add-on from admin back end. The error started when my webhost upgraded from MySQL 4 to 5. The discount add-on has a global discount and a product discount. This should be an easy fix if you are proficient in MySQL and osCommerce. Upon acceptance of bid, I will provide details of the errors as well as copies of the add-on files. Store is running on osCommerce 2.2 MS2 (MySQL 5.56; PHP 5.2.17).