Yeah, it's important to use a decrypted ROM. Encrypted ones aren't supported, and because of legal concerns, I have no plans to add support.
I believe I've fixed the issue in the latest version. Please try again with this one.
I don't know for sure if it will resolve the crash, but the latest build did fix a crucial bug, and I think it's worth a try. Alternatively, the version Wol38 linked to may work.