How to prevent user input service being triggered when a player is chatting?

Let's say that I have a this

local UIS = game:GetService("UserInputService")

function keypress(inputObject, GPE)
    if inputObject.KeyCode == Enum.KeyCode.G then
            -- A bunch of code
    end
end

UIS.InputBegan:connect(keypress)

How do I prevent this being key press whenever a player is using the "g" key to chat?

GameProcessedEvent is true while they are typing:

local UIS = game:GetService("UserInputService")

function keypress(inputObject, GPE)
	if not GPE then
		if inputObject.KeyCode == Enum.KeyCode.G then
			-- A bunch of code
		end
	end
end

UIS.InputBegan:connect(keypress)