Unable to cast value to object?

Help and Feedback Code Review
#1 
leaveButtonEvent.OnServerEvent:Connect(function(plr)
	if plr.Character then
		for i = 1, #queue do
			if queue[i] == plr.Character.Name then
				if queue[i] == plr.Character.Name then
					if queue[i + 1] then
						controlScreenEvent:FireClient(queue[i + 1])
					end
				end
				if queue[1] == plr.Character.Name then
					level.Text = "--------------------"
				end
				table.remove(queue, i)
				plr.Character.HumanoidRootPart.Position = Vector3.new(104.853, 5, -7)
				local tube = plr.Tube
				tube.Value = 0
				updatePlayerCount()
			end
		end
	end
end)

It doesn’t let me run controlScreenEvent:FireClient(queue[i + 1])

#2

What is inside the queue table?

#3

The player’s name is inside the table

#4

There is a bit of difference in the player instance and the player name, I guess my best guess is to make this change:

controlScreenEvent:FireClient(game.Players:FindFirstChild(queue[i + 1]))
#5

:FireClient() requires a Player instance