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()