java.lang.NullPointerException: Ticking block entity
at net.minecraft.tileentity.TileEntityHopper.func_152102_a(TileEntityHopper.java:429)

http://pastebin.com/n5G3xJHV

Cant seem to reproduce this one, what kind of seed was in it?

Are you trying on a client/server setup?

Also, fastcraft and kcauldron are running.

he suspects it was a rutabegga seed.

Yes: http://puu.sh/l9H6u/65da32a15f.png

Seed analyzer on top of the hopper..

Derp, my bad.

Still: http://puu.sh/laoui/84b06f319a.png

Does this happen every time, or was it a singular occurance? The crash log is obfuscated code and is quite hard to debug if I can't replicate it inside my dev env.

Both pictures of InfinityRadar's setup point into normal chests. I interpreted the title as the hopper pointing into a seed storage (block).
Agricraft 1.4.3
Minecraft 1.7.10
Forge 10.13.4.1541

That crashes if there is a journal in the seed analyzer after analyzing seeds. It didn't crash when there was no journal. Tested with potato and the iron seeds.

Also, when used with no journal: it didn't crash, but the seed was lost.

Crashlog: https://gist.github.com/VT-14/2f7dca44ac5e0ef313c7
Normal Log: https://gist.github.com/VT-14/df998349ab74b08ce931

Ah seed chest = Seed storage. Okay, yes there was possibility of crashing, and indeed the seeds were lost. This was fixed a few commits ago.

Commits: InfinityRaider@375edbc, InfinityRaider@af974fd