Attempt to index nil with "Position"

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#1

so im making a tower defense game, but when i saw the tower attack, it killed multiple enemies at once, i tried making it so it keeps killing the same enemy until its dead, but, i got the error:

Attempt to index nil with "Position"

here is the code that makes the tower attack:

					repeat
						wait(firerate)
						script.Parent.Parent.CFrame = CFrame.new(script.Parent.Parent.Position,v.PrimaryPart.Position)
						Attack(v)
					until not v

also, v is the enemy

#2

I wrote a Tower defense game a while ago, here is the place file.
Bloon-Defense.rbxl (1.9 MB)

#3

okay, ill read some of the code and try to understand it, im not the sharpest tool in the shed

#4

No problem, I wrote this my first few weeks of lua. The code is pretty simple and easy to understand for the most part.

#5

Does the enemy have a PrimaryPart? If not, then there’s your error.

#6

the enemy does have a primarypart

#7

In that case, could you print this:

script.Parent.Parent.Position
#8

it printed -100.24189758301, 1.2999954223633, 53.911167144775

1 Like
#9

And could you also print the enemy primary pos

#10

it printed -82.728439331055, 1.0999999046326, 81

plus i put it in a different spot

#11

A possible issue is that your code checks if v still exists, then there is a delay before it tries to get it’s position. Which means v could no longer exist after the delay, so it can’t get it’s position.

Instead, try placing the delay at the end of your repeat loop:

repeat
	script.Parent.Parent.CFrame = CFrame.new(script.Parent.Parent.Position,v.PrimaryPart.Position)
	Attack(v)
	wait(firerate) -- Delay at end here, then check if v still exists
until not v
#12

it still printed the error though.

#13

In that case, try some simple debugging

print(v ~= nil) -- prints true if v exists, false if not

Place this line before and inside your repeat loop, figure out where v doesn’t exist

#14

Have an if statement after the wait. I think the enemy still exists when the wait is called but it is gone after the wait.

#15

Can you show us the whole script?

#16

it printed true one time from before the repeat and 3 times inside the repeat

#17

here is the whole script:

local range = script.Parent.Configuration.Range.Value
local damage = script.Parent.Configuration.Damage.Value
local enemies = game.Workspace.Enemies
local idleAnim = script.Parent.Humanoid.Animator:LoadAnimation(script.Parent.Idle)
local shootAnim = script.Parent.Humanoid.Animator:LoadAnimation(script.Parent.Shoot)
local firerate = script.Parent.Configuration.Firerate.Value
idleAnim:Play()

coroutine.wrap(function()
	while true do
		range = script.Parent.Configuration.Range.Value
		damage = script.Parent.Configuration.Damage.Value
		firerate = script.Parent.Configuration.Firerate.Value
		wait()
	end
end)()

function Attack(target)
	idleAnim:Stop()
	spawn(function()
		shootAnim:Play()
		target.Health.Value -= damage
		script.Pistol:Play()
		shootAnim.Stopped:Wait()
		idleAnim:Play()
	end)
end

function Look()
	for i,v in pairs(enemies:GetChildren()) do
		if v then
		if v:IsA("Model") then
				if v and (v.PrimaryPart.Position - script.Parent.PrimaryPart.Position).Magnitude <= range/1.5 and v.Dead.Value == false then
					print(v ~= nil) -- prints true if v exists, false if not
					repeat
						print(v ~= nil) -- prints true if v exists, false if not
						script.Parent.Parent.CFrame = CFrame.new(script.Parent.Parent.Position,v.PrimaryPart.Position)
						Attack(v)
						wait(firerate)
					until not v
				else
					--enemy is dead so no code should be run
			end
		end
	end
	end
end

while true do
	Look()
	wait(firerate)
end
#18

nothing really happened, it still errored

#19

So it prints true, when does it start printing false?

#20

never, it never even prints false.