I fixed that bug upstream and in the package in the testing PPA. Reason for the crash was that Ubuntu recently started using AppStream components without a package name, and Discover apparently wasn't prepared for that (previously, libappstream prevented that from happening, which it doesn't do anymore now, since the 0.9.4 release).
I fixed that bug upstream and in the package in the testing PPA. Reason for the crash was that Ubuntu recently started using AppStream components without a package name, and Discover apparently wasn't prepared for that (previously, libappstream prevented that from happening, which it doesn't do anymore now, since the 0.9.4 release).
Discover with the PPA packages works well here.