Board Thread:LotR Mod Technical Support/@comment-27516710-20160516213130/@comment-27516710-20160517221314

Trying to look for one that isn't messy - right now the two ways of bypassing the crash are either deleting affected region files or running the server with the setting [removeErroringEntities=true]. The first option is messier if someone has a build nearby, hired units, etc. The second allows the server to run and automatically delete the offending entity.

Pouring over the differences between the NPC settings that work versus the setting(s) that get corrupted might take some time, but, if I had to guess it might be related to the ability to use chests and bonemeal and by downgrading the NBT data somehow gets corrupted.