Crash right after connecting to server in 15w31a

world loads but crashes a few seconds after losing into a server running on snapshot 15w31a, gives error- InternalException: io.netty.handler.codec.DecoderException:com.google.gson.JsonSyntaxException:com.google.gson.Stream.MalformedJsonException: UseJsonReader.setLenient(true) to accept malformed JSON at line 1 column 2