getting error

I get this error in the browser when try to add a product to the cart after enabling the restrict qty module.

Fatal error: Cannot use string offset as an array in /home/dependa5/public_html/dev/sites/all/modules/ubercart/contrib/uc_restrict_qty/uc_restrict_qty.module on line 88

Also I can't figure out how to adjust the settings in the product.

any help would be appreciated.
thanks