attempt to index field (a nil value)?

Line 65 saying attempt to index field (a nil value)?

local players = nil
local number = 1
local maxnumber = 0
local player = game.Players.LocalPlayer
script.Parent.Parent:WaitForChild("PlayerInfo"):WaitForChild("pName")

script.Parent.Next.MouseButton1Click:connect(function(right)
	players = game.Players:GetChildren()
	number = number + 1
	if players[number] ~= nil then
		script.Parent.Parent.PlayerInfo.Visible = true
game.Workspace.CurrentCamera.CameraSubject = players[number].Character.Humanoid
		script.Parent.Parent.PlayerInfo:WaitForChild('pName').Text = players[number].Name
		coroutine.resume(coroutine.create(function()
			players[number].Character.Humanoid.Changed:connect(function()
				if script.Parent.PlayerName.Text == players[number].Name then
					script.Parent.Parent.PlayerInfo.Health.Text = math.floor(players[number].Character.Humanoid.Health)
					script.Parent.Parent.PlayerInfo.Bar.Size = UDim2.new(players[number].Character.Humanoid.Health/players[number].Character.Humanoid.MaxHealth,0,.99,0)
				end
			end)
		end))
		if players[number].Name ~= player.Name then
			script.Parent.PlayerName.Text = players[number].Name
		else 
			script.Parent.Parent.PlayerInfo.Visible = false
			script.Parent.PlayerName.Text = "Nobody"
		end
	elseif players[number] == nil then
		number = 1
game.Workspace.CurrentCamera.CameraSubject = players[number].Character.Humanoid
		if players[number].Name ~= player.Name then
			script.Parent.PlayerName.Text = players[number].Name
		else 
			script.Parent.Parent.PlayerInfo.Visible = false
			script.Parent.PlayerName.Text = "Nobody"
		end
	end
end)

script.Parent.Previous.MouseButton1Click:connect(function(left)
	players = game.Players:GetChildren()
	maxnumber = #players+1
	number = number - 1
	if players[number] ~= nil then
		script.Parent.Parent.PlayerInfo.Visible = true
game.Workspace.CurrentCamera.CameraSubject = players[number].Character.Humanoid
		script.Parent.Parent.PlayerInfo:WaitForChild('pName').Text = players[number].Name
		coroutine.resume(coroutine.create(function()
			players[number].Character.Humanoid.Changed:connect(function()
				if script.Parent.PlayerName.Text == players[number].Name then
					script.Parent.Parent.PlayerInfo.Health.Text = math.floor(players[number].Character.Humanoid.Health)
					script.Parent.Parent.PlayerInfo.Bar.Size = UDim2.new(players[number].Character.Humanoid.Health/players[number].Character.Humanoid.MaxHealth,0,.99,0)
				end
			end)
		end))
		if players[number].Name ~= player.Name then
		    script.Parent.Parent.PlayerInfo.Visible = true
			script.Parent.PlayerName.Text = players[number].Name
		else 
			script.Parent.Parent.PlayerInfo.Visible = false
			script.Parent.PlayerName.Text = "Nobody"
		end
	elseif players[number] == nil then
		number = maxnumber
game.Workspace.CurrentCamera.CameraSubject = players[number].Character.Humanoid
		if players[number].Name ~= player.Name then
			script.Parent.PlayerName.Text = players[number].Name
		else 
			script.Parent.Parent.PlayerInfo.Visible = false
			script.Parent.PlayerName.Text = "Nobody"
		end
	end
end)