dhcp server response an empty RAI field

In rfc 3046 ------2.2 Server Operation ,it said If a server is unable to copy a full Relay Agent Information field into a response, it SHALL send the response without the Relay Information Field, and SHOULD increment an error counter for the situation.but kea dhcp response an illegal empty field, how to make dhcp ignore the option upon receive and will not echo it back on responses. thank you !