I have Zen 1.3.7

Trying to set up a coupon on a cart that previously had none.
I have installed the discount coupons module and get this message
Warning: Division by zero in /home/xxxxyz/public_html/xxx/admin/includes/classes/split_page_results.php on line 48
1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-0,' at line 1
in:
[select coupon_id, coupon_code, coupon_amount, coupon_type, coupon_start_date,coupon_expire_date,uses_per_user,uses_per_coupon,restrict_to_p roducts, restrict_to_categories, date_created,date_modified, coupon_active, coupon_zone_restriction from zen_coupons where coupon_active='Y' and coupon_type != 'G' limit -0, ]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.
I cant find a zero anywhere near line 48 in the split_page_results.php
nor can I find the text "select coupon_id" anywhere in that file.

Removed the module and reinstalled with no change.
Replaced the file on the server and reinstalled module with no change.

A clue for the clueless would be appreciated.
Thanks