Why wont it work? Focuslost

I have been making a chat gui, but my chatbox wont react when it loses focus. It works as it should if I play solo, but upon starting a server/going online it wont work and there is no error outputs:

script.Parent.FocusLost:connect(function(EnterPressed)
    if EnterPressed and script.Parent.Text ~= "" then
        script.Parent.Parent.Value.Value = script.Parent.Text
        script.Parent.Text = "Press T, /, or click here to chat"
    end
    if script.Parent.Text == "" then
        script.Parent.Text = "Press T, /, or click here to chat"
    end
end)

Anyone who can help?