[Warn] BlockMask

New What MythicMobs version or build # are you using?
MythicMobs-2.6.0-b1803

What server jar are you using?
Spigot 1.11

What MythicLib jar are you using?
MythicLib-1.0.2

Describe the bug.

Hello, sometimes i have this warn spam on my console, don't know what is it

http://pastebin.com/qDDyiHGm

thanks