Issue description: Server crashing when someone joins (only a certain player)

What you expected to happen: No crash? :)

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

• Minecraft: 1.12.2
• Forge: 14.23.1.2555
• Refined Storage: refinedstorage-1.5.25.jar

Does this issue occur on a server? [yes/no]
Yes

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

https://gist.github.com/Keaton1188/5c18ee61c85ee9f8dd1c4dd91c0f546f

From the user "last thing i did was place a RS crafter down, and before that I was trying to get the Reborn storage crafter to work"

Msg from a user as well.

This is most likely a Reborn Storage issue.

I added protection to avoid this crash but the root cause is really at Reborn Storage's side.

TechReborn/RebornStorage#70