http://openeye.openmods.info/crashes/c28912e3e63f1326165976f973bb5dbc

The thing about this is that the error handling should catch and handle the NPE, so I'm not sure what is going on. But, based on the stack my guess its a player head in the schematic. During the skull TileEntity load process during mod init it tries to look at the server/player data, and maybe that data has yet to be initialized.

Recommend not using player heads in schematics for the time being.

NOTE: The environment is based on Forge 10.13.4.1492. Needs to be pointed out that Restructured is built and tested against 1448. I don't think the Forge version is the issue, just pointing it out.

Released v1.0.1. with some changes. I can't replicate this issue so the changes are based on some assumptions.