Remote event argument gives me nil

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#1

‘Title’

jutsuReceiver.OnServerEvent:Connect(function(player, handSigns, mouse)
	if handSigns == "X" and game.ServerStorage.JutsusLearned[player.Name]:FindFirstChild("Shadow Clone") then
		ShadowClone(player, numberOfClones, despawnTime)
	end
end)

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#2

Firstly, what argument is returning nil. Secondly, what bit of code is calling the remoteevent?

#3

the player, it only works sometimes

if Input.UserInputType == Enum.UserInputType.MouseButton1 and #handSealsUsed > 0 then
	local tableConv = table.concat(handSealsUsed,"")
	game.ReplicatedStorage.JutsuReceiver:FireServer(tableConv, mouse)
	for index,_ in pairs(handSealsUsed) do
		handSealsUsed[index] = nil
	end
end