Execute sql error after replace username and password use read_auth

[Thomas Lee]

I use below code replace username and password in mysql-proxy

proxy.queries:append(1, proto.to_response_packet({
username = mapped.new_user,
response = password.scramble(
s.scramble_buffer, password.hash(mapped.new_password)),
charset = 8, -- default charset
database = c.default_db,
max_packet_size = 1 * 1024 * 1024
}))

login successed,but when execute multi select return error.
example: select * from users; select * from users;