Warning: Invalid argument supplied for....

Regarding the post below I thought I'd start a new thread for it.
https://awodev.com/forum/awocoupon/help-section/coupon-amount-incorrect-email#comment-3547

The post is related to this warning that I'm getting in the backend.
Warning: Invalid argument supplied for foreach() in /home/.../public_html/.../administrator/components/com_awocoupon/views/coupon/tmpl/default.php on line 303

I PM'd you the outcome of the debug as it may have content that I would prefer not to display on the live site.

Thank you!

It seems to work fine on the main site - the issue happened on the development site.

So I guess no need to investigate...

great, but just for completeness, the problem you are having is a collation problem of mixing up types within database tables. If you do want to fix it, this should help:
https://awodev.com/forum/awocoupon/help-section/adminitration-error-history-uses-coupons

Thank you. Appreciate it!