How to make the server pick a random object to spawn?

I'm trying to make it so that the server chooses a random number between 1 and 10 and using that number, spawn the correlating object. However, when the server tries to use the random number to spawn the object, I get this error:

22:44:39.473 - ServerScriptService.CoinSpawn:9: attempt to compare userdata with number

How can I avoid this? Here's the code:

local c1 = game:GetService("ServerStorage"):WaitForChild("Coins"):WaitForChild("Coin1")
local c5 = game:GetService("ServerStorage"):WaitForChild("Coins"):WaitForChild("Coin5")
local c10 = game:GetService("ServerStorage"):WaitForChild("Coins"):WaitForChild("Coin10")

while wait(2) do
	local cInStor = workspace:WaitForChild("CoinStorage"):GetChildren();
	if (#cInStor <= 100) then
		num = Random.new(1,10)
	if num <= 5 then
		local Clone = c1:Clone()
		Clone.Parent = workspace:WaitForChild("CoinStorage")
		Clone.CFrame = CFrame.new(math.random(-95, 125), (Clone.Size.Y/2), math.random(-91, 11))
	else if num >= 6 and num <= 9 then
		local Clone = c5:Clone()
		Clone.Parent = workspace:WaitForChild("CoinStorage")
		Clone.CFrame = CFrame.new(math.random(-95, 125), (Clone.Size.Y/2), math.random(-91, 11))
	else if num == 10 then
		local Clone = c10:Clone()
		Clone.Parent = workspace:WaitForChild("CoinStorage")
		Clone.CFrame = CFrame.new(math.random(-95, 125), (Clone.Size.Y/2), math.random(-91, 11))
	end
end
end
	else
		return
	end
end

EDIT: title spelling lol