Can't join server after updating to 14w32c

I expected that i joined the server:
Instead i got this error:
Internal Exception: io.netty.handler.codec.DecoderException: java.IoException: Packet 0/28 (kw) was larger than I expected, found 10 bytes extra whilst reading packet 28

1. try to join a 14w32c server with version 14w32c.