Why does it say "Attempt to index nil with 'Name'" in my gun script? Line72

I don't know what I could do about the error: ServerScriptService.MainScript:71: attempt to index nil with 'Name'? Here is the script for it: LINE 72 IS THE PROBLEM!

local serverStorage = game:GetService("ServerStorage")
local replicatedStorage = game:GetService("ReplicatedStorage")
local KOValue = "Kills"
local damage = 15

replicatedStorage.ShootEvent.OnServerEvent:Connect(function(player,tool,position,part)
	if game.Workspace[player.Name].Humanoid.Health <= 0 then
		-- The player is dead, do not do anything
	else
		local distance = (tool.tip.CFrame.p - position).magnitude
		if game.Workspace:FindFirstChild(player.Name.."'s Trajectory") then
			game.Workspace:FindFirstChild(player.Name.."'s Trajectory"):Destroy()
		end
		local trajectory = Instance.new("Part",game.Workspace)
		local smoke = serverStorage.SmokeParticle:Clone()
		smoke.Parent = tool.Handle
		trajectory.BrickColor = BrickColor.new("Institutional white")
		trajectory.Material = "SmoothPlastic"
		trajectory.Name = player.Name.."'s Trajectory"
		trajectory.Transparency = 0.5
		trajectory.Anchored = true
		trajectory.Locked = true
		trajectory.CanCollide = false
		trajectory.Size = Vector3.new(0.3,0.3, distance)
		for i = 0,distance,6 do
			trajectory.CFrame = CFrame.new(tool.Tip.CFrame.p,position) * CFrame.new(0,0,-distance / 2)
			wait(0.0001)
		end
		smoke:Destroy()
		if part then
			if part.Name == "Head" or part:IsA("Hat") and part.Parent:FindFirstChild("Humanoid").Health > 0 then
				replicatedStorage.Headshot:FireClient(player)
				damage=30
			end
			local humanoid = part.Parent:FindFirstChild("Humanoid")
			if not humanoid then
				humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
			else
				humanoid:TakeDamage(damage)
				if humanoid.Health <= 0 then
					player.leaderstats[KOValue].Value = player.leaderstats[KOValue].Value + 1
				end
			end
			wait(0.5)
			if trajectory then
				trajectory:Destroy()
			end
		end
	end
end)

replicatedStorage.EquipAnimation.OnServerEvent:Connect(function(player,animation)
	local newAnim = game.Workspace[player.Name].Humanoid:LoadAnimation(animation)
	newAnim:Play()
	replicatedStorage.UnequipAnimation.OnServerEvent:Connect(function(player,animation)
		newAnim:Stop()
		for i,v in pairs(game.Workspace:GetChildren()) do
			if v.Name == player.Name.."'s Trajectory" then
				v:Destroy()
			end
		end
	end)
	replicatedStorage.Reload.OnServerEvent:Connect(function(player,animation)
		newAnim:Stop()
		local reloadAnim = game.Workspace[player.Name].Humanoid:LoadAnimation(animation)
		reloadAnim:Play()
	end)
end)

function checkBodyType(player,tool)
	if game.Workspace[player.Name]:FindFirstChild("LowerTorso") then -- R15
		tool.shoot.AnimationId = "rbxassetid://5320645770"
		tool.reload.AnimationId = "rbxassetid://5320715605"
		return "R15"
	end
	if game.Workspace[player.Name]:FindFirstChild("Torso") then -- R16
		tool.shoot.AnimationId = "rbxassetid://5320789224"
		tool.reload.AnimationId = "rbxassetid://5320798913"
		return "R6"
	end
end
replicatedStorage.CheckBodyType.OnServerInvoke = checkBodyType()