Error with my script, check if something exists?

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1

Like I’m trying to check if the humanoid exists, otherwise don’t run the below code. Not sure what I’m doing wrong?


if not enemyHumanoid.Parent:FindFirstChild("HumanoidRootPart") then return end
				bloodEffect.Parent = enemyHumanoid.Parent.HumanoidRootPart
				game:GetService("Debris"):AddItem(bloodEffect, 3)

Error:

Workspace.NPCs.Team2.KnightTeam2.Script:44: attempt to index nil with 'FindFirstChild' - Server - Script:44

2 Likes
2

probably killed and removed before the code ran, happened to me before

local bloodPart = Instance.new("Part")
bloodPart.Size = Vector3.new(0.1, 0.1, 0.1)
bloodPart.Anchored = true
bloodPart.Transparency = 1
bloodPart.CanCollide = false
bloodPart.CFrame = enemy:GetPivot().Position 
-- I guessed, the variable won't go nil, it just sets the parent to nil
bloodPart.Parent = workspace

bloodEffect.Parent = bloodPart
game:GetService("Debris"):AddItem(bloodPart, 3)
3

Add before the first check:

if not enemyHumanoid.Parent then return end
4 
if not (enemyHumanoid and enemyHumanoid.Parent and enemyHumanoid.Parent:FindFirstChild("HumanoidRootPart")) then return end

bloodEffect.Parent = enemyHumanoid.Parent.HumanoidRootPart
game:GetService("Debris"):AddItem(bloodEffect, 3)
5

Yea even if I add these, if the instance is nil then it errors. Idk

6

It seems like the problem is that you’re trying to run FindFirstChild() with an instance that doesn’t exist. Maybe you can try to check if “enemyHumanoid.Parent” exists first:

if not enemyHumanoid.Parent or not enemyHumanoid.Parent:FindFirstChild("HumanoidRootPart") then return end
    bloodEffect.Parent = enemyHumanoid.Parent.HumanoidRootPart
    game:GetService("Debris"):AddItem(bloodEffect, 3)
7

I tried that too haha, same error.

9

Error is literal, enemyhumanoid doesn’t exist. Have you tried debugging?

10

Can you give me the path (or variable) that represents enemyHumanoid.Parent? With that I may be able to fix it.

11

Still errors, btw it’s 100% that it errors because it doesn’t exist. But isn’t that what this if statement is supposed to check for.

if not enemyHumanoid and not enemyHumanoid.Parent and not  nemyHumanoid.Parent:FindFirstChild("HumanoidRootPart") then return end
enemyHumanoid:TakeDamage(55)
				bloodEffect.Parent = enemyHumanoid.Parent.HumanoidRootPart
				game:GetService("Debris"):AddItem(bloodEffect, 3)
			break
		else
12

Can you provide the entire script / function where the error occurs

13

The thing is that if enemyHumanoid is nil, it won’t have a parent, therefore you would need to check if the parent exists first, then enemyHumanoid, and then HumanoidRootPart.

14 
task.wait(5)
print("running")




humanoid = script.Parent:WaitForChild("Humanoid")
destination = workspace:WaitForChild("EnemyDestination2")





local Animator = humanoid:WaitForChild("Animator")
local shockAnimation = Instance.new("Animation")
shockAnimation.AnimationId = "rbxassetid://12201480713"
local shockAnimationTrack = Animator:LoadAnimation(shockAnimation)
shockAnimationTrack.Priority = Enum.AnimationPriority.Action
shockAnimationTrack.Looped = true
shockAnimationTrack:Play()

function scanArea()
	local bloodEffect = game:GetService("ReplicatedStorage"):WaitForChild("Effects"):WaitForChild("Blood"):WaitForChild("Attachment"):Clone()
	local NPCs = workspace:WaitForChild("NPCs")
	local team1 = NPCs:WaitForChild("Team1")
	print("Scanning")
	local gatherPlayers = team1:GetChildren()
	if #gatherPlayers == 0 then
		humanoid:MoveTo(destination.Position)
		--print("0")
	end
	for i = 1, #gatherPlayers do
		if (gatherPlayers[i]:WaitForChild("HumanoidRootPart").Position - humanoid.RootPart.Position).Magnitude < 200 and
			(gatherPlayers[i]:WaitForChild("HumanoidRootPart").Position - humanoid.RootPart.Position).Magnitude > 25 
			and
			humanoid.Parent ~= gatherPlayers[i] then
			--print("In range attack")
			humanoid:MoveTo(gatherPlayers[i]:WaitForChild("HumanoidRootPart").Position)
			break
		elseif (gatherPlayers[i]:WaitForChild("HumanoidRootPart").Position - humanoid.RootPart.Position).Magnitude < 25 and humanoid.Parent ~= gatherPlayers[i] then
			--print("Damage")
			local enemyHumanoid = gatherPlayers[i]:WaitForChild("Humanoid")
			
			if not enemyHumanoid and not enemyHumanoid.Parent and not enemyHumanoid.Parent:FindFirstChild("HumanoidRootPart") then return end
enemyHumanoid:TakeDamage(55)
				bloodEffect.Parent = enemyHumanoid.Parent.HumanoidRootPart
				game:GetService("Debris"):AddItem(bloodEffect, 3)
				
			break
		else
			-- continue to castle
			--print("go to castle")
			humanoid:MoveTo(destination.Position)
			break
		end
	end
end

humanoid.HealthChanged:Connect(function(health)
	if health <= 0 then
		script.Parent:Destroy()
	end
end)


while true do
	wait(2)
	scanArea()
end
15

Maybe this will work?:

if not workspace.NPCs.team1:FindFirstChild(gatherPlayers[i].Name) or not gatherPlayers[i]:FindFirstChild("Humanoid") or not gatherPlayers[i]:FindFirstChild("HumanoidRootPart)

Edit: I forgot to mention that it is essential to use the or operator because and will check everything, thus, causing the same error, because of the use of :FindFirstChild() on nil