Getting kicked from notably faction servers on specific chunks.

This following message comes after iI have been happily wandering around the map until boom i get kicked and this message coes prior to getting kicked:
Internal Exception:oi.netty.handler.codec.decoderException:java.lang.indexoutofboundsException:readerindex(9) + length(1) exceeds writerIndex(9): UnPooledHeapBytebuf(ridx: 9, widx:9 cap: 9