This doesnt happen everytime, we've seen this crash about once a day now since the server has come up, enough to no longer consider it a fluke. Here is the full crashlog:

http://pastebin.com/J2cEvaFA

It seems to crash when it's being harvested by an MFR harvester.

ResourcefulCrops-1.7.10-1.0.0-18 with
MineFactoryReloaded-[1.7.10]2.8.1B1-113

edit; crash has also been reported with enderio farming station when the tool runs out, possibly related to #4 but not entirely sure if these are separate issues or not.

Hm... I'll play with it when I get home

EnderIO crash is also line 84 of BlockRCrop?

Yes also line 84 with the farming station

I'm just going to remove the ability to make "nether" seeds for now. It was a very poor implementation.

Under heavy stress testing, I am not able to reproduce the crash after removing the nether seeds. I didn't attempt prior, though. So unsure if issue is fixed..