Why is this value nil in text filtering script?

Ive set up these two functions so that when a remote event and function are triggered, certain functions happen that filter the text and give it back to the player in a text label. When I test this ingame I get the following error:

-- Error filtering message: ServerScriptService.TextFilter:27: attempt to index global 'text' (a nil value)

And here is the script in ServerScriptService:

local summary = game.ReplicatedStorage.Summary.Value
function Filter()
	local TextService = game:GetService("TextService")
	local sumname = game.ServerStorage.Summarizer.Value
	local summarizer = game.Players[sumname].UserId
	local filteredMessage = ""
	summary = game.ReplicatedStorage.Summary.Value
	success, errorMessage = pcall(function()
		text = TextService:FilterStringAsync(summary, summarizer)
	end)
	if success then
		return text
	elseif errorMessage then
		print("Error filtering message:", errorMessage)
	end
end 

game.ReplicatedStorage.FilterEvent.OnServerEvent:Connect(Filter)

function sendFiltered()
	wait (0.1)
	local TextService = game:GetService("TextService")
	local sumname = game.ServerStorage.Summarizer.Value
	local filteredMessage = ""
	success, errorMessage = pcall(function()
		filteredMessage = text:GetNonChatStringForBroadcastAsync()
	end)
	if success then
		return filteredMessage
	elseif errorMessage then
		print("Error filtering message:", errorMessage)
	end
	return false
end

game.ReplicatedStorage.Filter.OnServerInvoke = sendFiltered()

Thanks in advance for the help!