robotmedia/RMStore — pull request #105 by aporat (2014-09-04 02:01:44+00:00)
Title: Workaround for nil productIdentifier in jailbroken devices

see http://stackoverflow.com/questions/19817130/following-in-app-purchase-app-crashing-on-startup-productidentifier-nil for the complete info on the issue. a nil if statement resolve the issue