Hello,
Please edit the HikaMarket discount class and replace
'.JHTML::_('hikaselect.radiolist', $values, 'data[discount][discount_target_vendor]' , 'onclick="hikamarket_discount_setVendor(this, true);" onchange="hikamarket_discount_setVendor(this, false);"', 'value', 'text', @$discount->discount_target_vendor).
By
'.JHTML::_('hikaselect.radiolist', $values, 'data[discount][discount_target_vendor]' , 'onclick="hikamarket_discount_setVendor(this, true);"', 'value', 'text', @$discount->discount_target_vendor).
Regards,