RandomTP

[NiLSPACE]

The chunk is most likely not loaded. Try this:

local X = math.random(-2000, 2000)
local Z = math.random(-2000, 2000)
local _, Height

local World = Player:GetWorld()
World:ChunkStay({math.floor(X / 16), math.floor(Z / 16)}, nil, 
	function()
		_, Height = World:TryGetHeight(X, Z)
	end
)

It will ensure that the chunks are loaded and then get the height.

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Btw, I didn't test this code. There might be a syntax error in it.