Unsure about this crash to be honest, whether its EE3 or FZ.
Possibly due to this? at factorization.coremod.AirInspector.transform(AirInspector.java:21)

http://openeye.openmods.info/crashes/345bd70507ee3b417ad9d64b50ef51dd

Scratch that, apparently it was down to the wrong Natura version.