Why does my string turn out as a nil value after I fire the client?

I did 2 scripts. One in StarterGui and one in SSS. The one in SSS filters a sting and prints it out correctly. But, when I fire the client it says "nil" when it comes out. Help?

SSS:

local rs = game:GetService("ReplicatedStorage")

local remote = rs:WaitForChild("Filter")

remote.OnServerEvent:connect(function(_,player,chat)
	 local chat= game:GetService("Chat"):FilterStringForBroadcast(chat,player)
	print(chat)
	print(player)
	remote:FireClient(player,chat)
end)

StarterGui

script.Parent.MouseButton1Click:connect(function()
player= game.Players.LocalPlayer
 local chat= script.Parent.Parent.NewName.Text
game.ReplicatedStorage.Filter:FireServer(player,chat)




end)
game.ReplicatedStorage.Filter.OnClientEvent:connect(function(player,chat)
	print(chat)
	script.Parent.Text=chat
end)

OnClientEvent does not pass the player it's fired to as its first argument since it's pretty pointless. If you call FireClient() with two arguments, OnClientEvent should have one. In your line game.ReplicatedStorage.Filter.OnClientEvent:connect(function(player,chat), player would actually be the chat argument that you passed, chat would be nil.

script.Parent.MouseButton1Click:connect(function()
	local player = game.Players.LocalPlayer
	local chat= script.Parent.Parent.NewName.Text
	game.ReplicatedStorage.Filter:FireServer(player,chat)
end)
game.ReplicatedStorage.Filter.OnClientEvent:connect(function(chat)
    print(chat)
    script.Parent.Text=chat
end)