Issue description:

Sometimes there are slots in the grid that show 0 (Must be air?) When hover over them or scrolling in the inventory it seems to crash to desktop.

What happens:

Crash to desktop when rendering a null stack (null pointer exception renderscreen)

What you expected to happen:

Not to crash/ have empty item stacks rendered

Steps to reproduce:

1.Open grid
2.Shift-click items into the system.
3.When looking at the items in your system notice a slot with 0 and nothing in it.
...

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

• Minecraft: 1.11.2
• Forge: 13.20.0.2282
• Refined Storage: 1.4.3

Does this issue occur on a server? [yes/no]
Yes and single player also

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

https://pastebin.com/sSAtuWpC

This is what the issue looks like :)
https://gyazo.com/bc051332bf0959ba7c0a62533c733a04

I can't reproduce this issue with your provided reproduction steps. Please provide better reproduction steps.

Interesting :/ but it happens and I have the image showing what is happening. Maybe its because I am using the external storage with drawers?

I need exact reproduction steps

Okay I think I have it now.
With using an external storage hooked to a drawer controller
1.Open crafting grid (things look fine)
2.Place down another drawer next to your drawer controller
3.Check crafting grid
4.Repeat a few times and this 0 item appears in the list when hovered over it crashes the game.
Simply breaking the external storage and replacing gets rid of this 0 item but it will occur every few extra drawers you add on AFTER the external storage is already hooked into the drawers set up.
Hopefully this will help :3

Interesting, let me look into this

Duplicate of #1183