I'm not sure if this is an issue on your end or Ice and Fire's end, but for some reason when placing a jar of any kind (from Ice and Fire), it causes a crash. I've opened up an issue on Ice and Fire just to cover all my bases.

Link to issue on Ice and Fire's Repo
Ice and Fire's Repo
Crash log

Thanks for reporting! Yep this is an issue on Ice and Fire's end, similar to other mods with same error, breaking capability contract by returning null instead of an empty LazyOptional.