Insufficienct permission chat command

Hello,

I have this chat event :

AddEventHandler(“chatMessage”, function(p, color, msg)
if msg:sub(1, 1) == “/” then
fullcmd = stringSplit(msg, " ")
cmd = fullcmd[1]

    if cmd == "/top" then
    	TriggerClientEvent("topCommand", p)
    end
end

end)

So when I type “/top” in chat, event work but I have a chat message : “SYSTEM : Insufficienct permissions”.

Are you an ideas for delete this system message ?

Regards,