Ive seen a couple posts about this, from what I understand this occurs when a message is sent to "a person" who is not a client (like a bot?) or when a message is sent with out an ID.
Are these teh only times this message will occur?
Will doing a is_user_connecte(id) check before sending all messages be a good way to work arround this?
Does this only apply to hud messages (set_hudmessage/show_hudmessage) or does it also apply to client messages (client_print) ?