Workspace.Dummy.FollowAndAttack:7: attempt to index nil with 'Humanoid'?

So I have a script that checks if the humanoid exists and then attacks it, but I get the error: Workspace.Dummy.FollowAndAttack:7: attempt to index nil with 'Humanoid' on line 7 and I don't know how to fix it. Here's the line that the error is on:

if v and v:FindFirstChild("Humanoid") and v:FindFirstChild("HumanoidRootPart") and v ~= script.Parent and v.Humanoid and v.Humanoid.DisplayName ~= script.Parent.Humanoid.DisplayName and v.Humanoid.Health > 0 and script.Parent.Humanoid.Health ~= 0 then

And here's the full code:

local d = false
local maxDistance = 1000
local PathfindingService = game:GetService("PathfindingService")
while wait() do
    local nearestCharacter, nearestDistance
    for i, v in pairs(workspace:GetChildren()) do
        if v and v:FindFirstChild("Humanoid") and v:FindFirstChild("HumanoidRootPart") and v ~= script.Parent and v.Humanoid and v.Humanoid.DisplayName ~= script.Parent.Humanoid.DisplayName and v.Humanoid.Health > 0 and script.Parent.Humanoid.Health ~= 0 then
            character = v
            local distance = (script.Parent.HumanoidRootPart.Position - v.HumanoidRootPart.Position).magnitude
            if not character or distance > maxDistance or (nearestDistance and distance >= nearestDistance)
            then
                continue
            end
            nearestDistance = distance
            nearestCharacter = v
            local Destination = v.HumanoidRootPart.Position
            local Path = PathfindingService:CreatePath()
            local NPC = script.Parent
            local Humanoid = NPC.Humanoid
            Path:ComputeAsync(NPC.PrimaryPart.Position, Destination)

            local activeCoroutine = nil
            local follow=true

            -- Loop update
            coroutine.wrap(function()
                while (follow) do
                    wait(1/3)
                    update()
                end
            end)()


            function update()
                if script.Parent.Humanoid.Health ~= 0 then
                    Path:ComputeAsync(NPC.PrimaryPart.Position, Destination)
                end

                local Waypoints = Path:GetWaypoints()
                table.remove(Waypoints, 1)  -- First waypoint seems to always be origin

                coroutine.wrap(followPath)(Waypoints)
            end
            function followPath(waypoints)
                activeCoroutine = coroutine.running()
                for _, point in ipairs(waypoints) do
                    if activeCoroutine~=coroutine.running() then
                        return end

                    Humanoid:MoveTo(point.Position)
                    Humanoid.MoveToFinished:Wait()
                    if point.Action==Enum.PathWaypointAction.Jump then
                        Humanoid.Jump = true 
                    end
                end
            end
            local viewray = Ray.new(script.Parent.Head.Position, nearestCharacter.Head.Position)
            local hit, position = workspace:FindPartOnRayWithIgnoreList(viewray, {script.Parent})
            local gunray = Ray.new(script.Parent.AssaultRifle.Shoot.Position, nearestCharacter.Head.Position + Vector3.new(math.random(0, 2), math.random(0, 2), math.random(0, 2)))
            local hit1, position1 = workspace:FindPartOnRayWithIgnoreList(gunray, {script.Parent})
            local mag = 30
            if hit and (script.Parent.HumanoidRootPart.Position - nearestCharacter.HumanoidRootPart.Position).magnitude < 900 then
                script.Parent.HumanoidRootPart.CFrame = CFrame.new(script.Parent.HumanoidRootPart.Position, nearestCharacter.Head.Position)
                local anim = script.Parent.Humanoid:LoadAnimation(script.Pew)
                anim:Play()
                script.Parent.AssaultRifle.Shoot.Shot:Play()
                script.Parent.AssaultRifle.Muzzle.Muzzle1:Emit(15)
                script.Parent.AssaultRifle.Muzzle.Muzzle2:Emit(15)
                script.Parent.AssaultRifle.Muzzle.Muzzle3:Emit(15)
                script.Parent.AssaultRifle.Muzzle.MuzzleFlash:Emit(15)
                script.Parent.AssaultRifle.Muzzle.Muzzle.Enabled = true
                if (script.Parent.HumanoidRootPart.Position - nearestCharacter.HumanoidRootPart.Position).magnitude < 900 and hit and hit1 then
                    if hit1.Parent:FindFirstChild("Humanoid") then
                        hit1.Parent.Humanoid:TakeDamage(30)
                    end
                end
            end
        end
        if script.Parent.Humanoid.Health == 0 then
            break
        end
    end
    script.Parent.FollowAndAttack:Destroy()
    end