Create Blank line cause the entire order to corrupt

Just tested Ubercart 2.4 with UC Discount Framework dev - July 11, 2010. Make it 5% discount on a product. All works fine until I tried to add "Blank Line", Enter product information. (Name, SKU, Barcode, Weight and Price)

Once I clicked at "Apply to Order" The error shows up :

Fatal error: __clone method called on non-object in /public_html/sites/all/modules/uc_discount/uc_discount.module on line 111

Once that happened, I can't access any information on that order # anymore.