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Attempt to index nil with 'Position'?

Asked by

naturedat 124

4 years ago

Edited 4 years ago

I'm basically just making an enemy npc that goes to the nearest npc in the game and attack each other. This script is located in the npc. The error is in line 29. Help please:

01local dis = math.huge
02local rot = script.Parent.HumanoidRootPart.Position
03local animation = script:WaitForChild("Animation")
04local hold = script:WaitForChild("Hold")
05local human = script.Parent:WaitForChild("Humanoid")
06local ani = human:LoadAnimation(animation)
07local anima3 = human:LoadAnimation(hold)
08anima3:Play()
09ani:Play()
10 
11function findNearestHumanoid(pos)
12    local list = game.Workspace:GetChildren()
13    for i = 1,#list do
14        local v = list[i]
15        if v.ClassName == "Model" and v ~= script.Parent then
16            local rootpart = v:FindFirstChild("HumanoidRootPart")
17            local humanoid = v:FindFirstChildWhichIsA("Humanoid")
18            if humanoid ~= nil and rootpart and humanoid.Health <= 0 then
19                if (rootpart.Position - pos).Magnitude < dis then
20                    local space = rootpart
21                    return space
22                end
23            end
24        end
25    end
26end
27 
28while true do
29    wait(1)
30    local map = findNearestHumanoid(rot).Position - rot  -- Attempt to index nil with 'Position' here
31    local mag = map.Magnitude
32    if mag < 3 then -- th NPC stops when they get close enough
33        ani:Stop()
34    else
35        ani:Play()
36    end
37    local target = findNearestHumanoid(script.Parent.HumanoidRootPart.Position)
38    if target ~= nil then
39        script.Parent:FindFirstChildWhichIsA("Humanoid"):MoveTo(target.Position)
40    end
41end
 View all 41 lines...

Thank you!

1 answer

Answered by

Necro_las 412

4 years ago

Edited 4 years ago

Your function findNearestHumanoid() can return nil if there is no one near, and then you cant get nil.Position. I recomend creating a variable to check its presence, like:

1local nearestHumanoid = findNearestHumanoid(rot)
2local map
3if nearestHumanoid then
4    map = nearestHumanoid.Position - rot
5end

Thanks, I actually found out why the function returned nil, it was because on line 18, humanoid.Health <= 0 so it was a stupid mistake but thanks! naturedat 124 — 4y

Attempt to index nil with 'Position'?

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