error when deleting old customers

I upgraded an old version of zencart to the newest and everything is working fine except when I try to delete old customers I get this error:

Warning: reset() [function.reset]: Passed variable is not an array or object in /home/cowtownw/public_html/admin/includes/classes/object_info.php on line 29

Warning: Variable passed to each() is not an array or object in /home/cowtownw/public_html/admin/includes/classes/object_info.php on line 30

The site functions fine and I guess I can just leave the old customers, I was just wanting to see if anyone could tell me if this was bad and something else could be wrong, or what the deal is.

Thanks

you might have to delete the old customers by using MySQL, and write a small query.
You will need to get into the db and find what tables and field you are using.
You might be able to also find the customers in the db within the tables.
If your using XAMMP you should be able to do this.
Remember to backup your db before you do any changes

nomad