Can somebody help me with my random player tables?

So when I tried to play test my game which I had to fix at least three times now, I can not seem to figure out how to get a random player from a table and change their character. It worked for me the first time when I tested, but now, it will not. The error I got was "15:08:48.605 - ServerScriptService.Script:54: bad argument #2 to 'random' (interval is empty)" here's where the error took me to.

local num = math.random(1,#plrs)
                        plrs[num].Character = game.ServerStorage.Telamon
                        game.ServerStorage.Telamon.Parent = workspace
                        wait(0)
                        workspace:FindFirstChild("Telamon").HumanoidRootPart.CFrame = clonedMap.MonsterSpawn.CFrame
                        table.remove(plrs, num)