[SEVERE] Block at (cords) is furnace but has null

I noticed that the other day this new [SEVERE] error is showing up in my console. I havent noticed anything wrong on the server at all. Furnaces work 100% and nothing is abnormal.

This is the full error:
[SEVERE] Block at -180,53,123 is FURNACE but has null. Bukkit will attempt to fix this, but there may be additional damage that we cannot recover.

The "-180,53,123" are the cords of the furnace and therefore vary from furnace to furnace.

1. OS: XP SP3
2. Architecture: 32bit? doesnt say in system info, but doesnt have "program filesX86" folder
3. Java: fully updated (got update yesterday)
4. Wrappers: None, just a port forward.
5. CB Build: 1938
6. Commands to run: ??
7. Plugins: PEX, Openinv, sponge restore, VoxelSniper, essentials, essentials chat, ModifyWorld (PEX), ChunkScrambler, Lockette, noweather, supercauldrons, Craftpedia, Console name, Consolelikechat, and AntiCreeper.
8. Error: [SEVERE] Block at -180,53,123 is FURNACE but has null. Bukkit will attempt to fix this, but there may be additional damage that we cannot recover.

An explanation would be appreciated and a solution would be cookie worthy..

Am i allowed to bump?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Please do a search before asking questions.

It's a harmless message, but you'll need a dev build to fix it.

No.