Connection Lost - Internal Exception

Kicked within a few seconds of joining the server with the following error message:
Connection Lost
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

Only happening to one player so far. Player is in The End. Other players in the overworld do not seem to be effected.

More testing to follow.