Repeat wait() until a value isn't nil. How can I do?

Hello, I'm facing a problem that i can't revolve by myself unfortunaly.

local player = game.Players.LocalPlayer

repeat wait() until not player.Stats:WaitForChild("R_KeyMoveset").Value == nil

while wait() do
	if player.Stats:WaitForChild("R_KeyMoveset").Value == nil then
		wait()
	else
		print(game.ReplicatedStorage.Movesets:FindFirstChild(player.Stats:WaitForChild("R_KeyMoveset").Value).Name.Value)
		local move = game.ReplicatedStorage.Movesets:FindFirstChild(player.Stats:WaitForChild("R_KeyMoveset").Value).Name.Value
		script.Parent.Text = script.Parent.Parent.Key.Value.." - "..move
	end
end

So first if i remove the line with the repeat the script will go to the second option (value isn't nil or "") and if i let it the script is still waiting. I need help to wait until the value isn't nil. Thanks for answers