Issue Description:

When placing an advanced sensor next to an enderio inventory scanner the game instantly crashes with a "nullpointerexception"

What happens:

The game crashes with an "nullpointerexception"

What you expected to happen:

Nothing

Steps to reproduce:

1. Place Xnet advanced blue connector
2. Place enderio inventory scanner next to it
3. Client Crash

Affected Versions (Do not use "latest"):

• Minecraft{1.10.2}
• Forge{12.18.3.2316}
• Endercore{1.10.2-0.4.1.66-beta}
• EnderIO{1.10.2-3.1.193}
• xnet{1.3.2} and xnet{1.4.0}

Your most recent log file where the issue was present:

Only xnet+enderio: https://pastebin.com/JTEuGvdY
In FTBBeyond: https://pastebin.com/epFhWJ3j

Reported to xnet --> Closed by modauthor

McJtyMods/XNet#148

Look at the Javadoc and call pattern. Null is a valid value here. It means that a block that is diagonally below the block is checking. Used in vanilla for redstone to go up.