Extra bytes in packet 32

When cloning blocks the error occurs sporadically to all players connected then they get a "packet was larger than I expected" error

Server shows before kicking players

[22:32:40] [Netty Epoll Server IO #15/ERROR]: java.lang.IndexOutOfBoundsException: readerIndex: 36950 (expected: 0 <= readerIndex <= writerIndex(18475))
[22:32:40] [Netty Epoll Server IO #15/ERROR]: java.lang.IndexOutOfBoundsException: readerIndex: 36950 (expected: 0 <= readerIndex <= writerIndex(18475))

Client Logs show no errors

My error message
http://i.imgur.com/kntoAhG.png
Shared by SonarBeserk
http://i.imgur.com/HkFqZcD.jpg