Request Rejected Datastore?

Heya. I'm trying to get the game to check if the player has visited before, and if not, then set the Async to "1" and continue incrementing for that player each time he/she joins. I read up on the forum, and I unfortunately need to check the key before I set it. Thanks!

	local hasJoined = ds:GetAsync(newplayer.Name.."_JOIN")
	if hasJoined == nil then
		isprevioususer = 0
		ds:SetAsync(newplayer.Name.."_JOIN", 1)
	elseif hasJoined >= 1 then
		isprevioususer = hasJoined
		ds:IncrementAsync(newplayer.Name.."_JOIN", 1)
	end

I heard of this problem somewhere. Replace line 2 with

if not hasJoined then

If that doesn't work then try

if type(hasJoined) ~= number then

I believe an empty key in a data store returns something but not nil.