This is block break.

This message popped up in my server console yesterday and it has kept spamming it since then. I'm unsure whether it affects performance, but I'd like to get rid of it either way.
Does anyone know what plugin could be causing this ridiculous error?

Code:

12.06 18:24:36 [Server] INFO This is block break.
12.06 18:24:35 [Server] INFO This is block break.
12.06 18:24:35 [Server] INFO This is block break.
12.06 18:24:34 [Server] INFO This is block break.
12.06 18:24:34 [Server] INFO This is block break.
12.06 18:24:33 [Server] INFO This is block break.
12.06 18:24:33 [Server] INFO This is block break.
12.06 18:24:33 [Server] INFO This is block break.
12.06 18:24:33 [Server] INFO This is block break.
12.06 18:24:32 [Server] INFO This is block break.
12.06 18:24:32 [Server] INFO This is block break.
12.06 18:24:32 [Server] INFO This is block break.
12.06 18:24:31 [Server] INFO This is block break.
12.06 18:24:31 [Server] INFO This is block break.
12.06 18:24:31 [Server] INFO This is block break.
12.06 18:24:31 [Server] INFO This is block break.
12.06 18:24:30 [Server] INFO This is block break.
12.06 18:24:30 [Server] INFO This is block break.
12.06 18:24:30 [Server] INFO This is block break.
12.06 18:24:30 [Server] INFO This is block break.
12.06 18:24:29 [Server] INFO This is block break.
12.06 18:24:29 [Server] INFO This is block break.
12.06 18:24:28 [Server] INFO This is block break.
12.06 18:24:28 [Server] INFO This is block break.
12.06 18:24:28 [Server] INFO This is block break.
12.06 18:24:28 [Server] INFO This is block break.
12.06 18:24:27 [Server] INFO This is block break.

 

What plugins have you installed​

 

It is the latest MobArena. He said he should have a fix for it later today.

 

Thank you.