What were you doing when the issue happened?

When you craft an item in the project table in multiplayer, when you hover over the output item and another player take the ingredient out, you are still able to craft the item

What did you expect to happen?

What happened instead

Full Log and Crashlog on pastebin/gist

Forge and Minecraft version

1.15.2
31.2.31

Bluepower version and build number

0.4

Fixed in 1.16.4, I'll backport the fix tonight as it is a dupe bug, but not planning on backporting features, as there is plenty yet to be ported.

Ah ok cool, found it while playing qtech :p

Should be fixed in bluepower-1.15.2-0.4.226-alpha-universal.jar