How to check if something exists?

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,
#1 
Hit.Parent:FindFirstChild("Humanoid")

Doesnt work bc then I get the error code Attempt to index nil with FindFirstChild.
Should i put it in a pcall?

1 Like
#2

Hello,
Could you clarify to us where you get Hit from?

#3 
if Hit.Parent:FindFirstChild("Humanoid") then
-- Instance exists!
else
-- Instance doesn't exist.
end
1 Like
#4

The error is already in the first line

#5

Yes, sorry didn’t really read your post when i posted the script : /. The same as @PixelBytezz said. Where did you get .Hit from?

#6

From a touched Event but I forgot to write it here

#7

Okay, please post the full .Touched event so i can help fix the problem.

#8

This just means that Hit.Parent is nil. You should check that Hit.Parent is not nil first by doing:

if (Hit.Parent) then
    if (Hit.Parent:FindFirstChild("Humanoid") then
        -- code
    end
end

Although I’m not sure why Hit.Parent would be nil, it would be interesting to see your full script.

1 Like
#9

Problem happens here with :HasTag

local HitBox = {}
function HitBox.new(character, size, offset, damage, HitBoxTime, Waiting,Attack) -- creates hitbox
	local hrp = character:FindFirstChild("HumanoidRootPart")
	if hrp == nil then return end
	local weld = Instance.new("WeldConstraint", hrp)
	if Waiting >= 0 then task.wait(Waiting) end -- Delay
	local hitbox = Instance.new("Part")
	weld.Part0 = hrp
	weld.Part1 = hitbox

	hitbox.CanCollide = false
	hitbox.CanQuery = true
	hitbox.Massless = true
	hitbox.Transparency = 0.5
	hitbox.Name = "HitBox"
	hitbox:AddTag(Attack)
	hitbox:SetAttribute("damage", damage)

	hitbox.Size = size
	hitbox.CFrame = hrp.CFrame + hrp.CFrame.LookVector * offset.X + Vector3.new(0,offset.Y)
	hitbox.Parent = character

	hitbox.Touched:Connect(function(hit)
		local Humanoid = hit.Parent:FindFirstChild("Humanoid")
		local NPC =	hit.Parent:FindFirstChild("Humanoid"):HasTag("NPC")
		
		if Humanoid == nil or NPC then return end 


		for _, v in pairs(hitbox:GetChildren()) do
			if v:IsA("ObjectValue") then
				if v.Value == hit.Parent then return end 
			end
		end

		local hitCounter = Instance.new("ObjectValue", hitbox)
		hitCounter.Value = hit.Parent
		hit.Parent.Humanoid:TakeDamage(damage)
	end)
	game.Debris:AddItem(hitbox, HitBoxTime)
end
return HitBox
#11

Nevermind what i said forgot you were the original poster, no idea how tough.

#12

Try adding a check for Humanoid:

hitbox.Touched:Connect(function(hit)
		if not hit.Parent:FindFirstChild("Humanoid") then return end
#13

Wait i wanted to write to check if something doesnt exist

#14

For this line to work (:HasTag("NPC") it has to first find a humanoid. If it doesn’t then it will error:

local NPC = hit.Parent:FindFirstChild(“Humanoid”):HasTag(“NPC”)

So first check if the humanoid exists. If it does not, then return so the script does not error.

	hitbox.Touched:Connect(function(hit)
		if not hit:FindFirstChild("Humanoid") then return end
#15

After getting the humanoid variable you should return if it is nil

#16

I’ll assume that your script is inside the part that has the touch event in.
Hopefully this helps:

script.Parent.Touched:Connect(function(hit)
    if not Hit.Parent then return end
    if Hit.Parent:FindFirstChildOfClass("Humanoid") then
      -- Found player
    end
end)
#17

i like how this and

are already the correct solutions, yet this post is still unsolved lol

#18

didn’t have any time to programm bc I needed to study.
But it works inside a pcall.

#19

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