Internal Exception: io.netty.handler.codec.DecoderException: Java.io.IOException: Packet 0/72 (ia) was larger than I expected, found 19 bytes extra whilst reading packet 72

Internal Exception: io.netty.handler.codec.DecoderException: Java.io.IOException: Packet 0/72 (ia) was larger than I expected, found 19 bytes extra whilst reading packet 72

I saw this error messege. When I was in my 15w43a test server.
I still don't know what was happening. plz check it out that bug.

I used this snapshot server version.

https://mojang.com/2015/10/minecraft-snapshot-15w43a/

Thanks