Issue description:

Crashing when autocrafting an MFSU. Everything is crafted from base materials, so it's routing through macerators and compressors and so on.

Started up the autocraft, the whole game crashed after like 2 seconds. Loading the world now makes it work for like 2 seconds then it crashes again.

Version (Make sure you are on the latest version before reporting):

• Minecraft: 1.10.2
• Forge: Honestly can't find this. Whichever dw20 pack for 1.10.2 uses.
• Refined Storage: 1.2.6 ( triggered it on 1.2.4, world's still corrupt when using 1.2.6. )

Does this issue occur on a server? [yes/no]
Only tested in singleplayer.

If a (crash)log is relevant for this issue, link it here:

http://pastebin.com/bBrbsmfj

Just found it's a dupe of #586. Don't know how I didn't see that one before when scrolling through the issues.