What happens:

I tried to open the grid and Minecraft shutdown.
Crashlog says a Nullpointexception occured at:
com.raoulvdberge.refinedstorage.gui.grid.GuiGrid.drawForeground(GuiGrid.java:462)

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

• Minecraft: 1.12
• Forge: 14.21.1.2387
• Refined Storage: 1.5.6

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

No idea, I'm playing singleplayer.

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

https://pastebin.com/hQB9BAG3