What does this mean? Workspace.GameAI.AI.AI:256: attempt to index nil with 'IsA'

Help and Feedback Scripting Support
#1

I keep getting this error, “Workspace.GameAI.AI.AI:256: attempt to index nil with ‘IsA’”

-- local AI  = script.Parent
local hipHeight = AI.Humanoid.HipHeight
local TP = Instance.new("BindableEvent")
local Safe_Zone_ = workspace.Safe_Zone:GetChildren()
local PathfindingService = game:GetService("PathfindingService")
local TargetedEvent = game:GetService("ReplicatedStorage"):WaitForChild("TargetedRingMaster")
local _Path = require(game:GetService("ServerScriptService"):WaitForChild("SCRIPT_MODULE"):WaitForChild("_Path"))
local Runing = false -- if he is running or not (do not change that)
local Sacer = false -- old jumpscare system
local Foot = false
local root = AI.HumanoidRootPart

local SETTINGS = {
	Max_distance_Chase = script.Parent.Configurations.Vision.MaxChaseDis.Value;
	Max_distance_Listens_To_Foot_Sounds = script.Parent.Configurations.Vision.HearMaxDis.Value;
	See_Path = script.Parent.Configurations.SeePath.Value;
	Sound_Chase = nil;
}

local Speed = {
	Speed_Walk = 13;
	Speed_Run = 25;
}
if SETTINGS.Sound_Chase ~= nil then
	SETTINGS.Sound_Chase.Playing = false
end
AI.Humanoid.WalkSpeed = Speed.Speed_Walk
local pathParams = {
	["AgentHeight"] = AI.Humanoid.HipHeight,
	["AgentRadius"] = script.Parent.HumanoidRootPart.Size.X,
	["AgentCanJump"] = false
	
}

laughon = false
if script.Parent.Configurations.ChaseLaugh.ChaseLaugh.Value == true then
	laughon = true
	chaselaugh = script.Parent.Configurations.ChaseLaugh.LaughLocation.Value
else
	laughon = false
end
local function getHumPos()
	return (AI.HumanoidRootPart.Position - Vector3.new(1,hipHeight,2))
end
local function FindPotentialPlayer()
	local players = game.Players:GetPlayers()
	local maxDistance = script.Parent.Configurations.Vision.VisionMaxDis.Value
	local nearestTarget

	for index, player in pairs(players) do
		if player.Character and player.Character:FindFirstChild("HumanoidRootPart") then
			if player.Character.Humanoid.Health > 0 then
				local target = player.Character
				local distance = (AI.HumanoidRootPart.Position - target.HumanoidRootPart.Position).Magnitude

				if distance < maxDistance then
					nearestTarget = player
					maxDistance = distance
				end
			end
		end
	end

	return nearestTarget
end

local function displayPath(waypoints)
	local color = BrickColor.Random()
	for index, waypoint in pairs(waypoints) do
		local part = Instance.new("Part")
		part.BrickColor = color
		part.Anchored = true
		part.CanCollide = false
		part.Size = Vector3.new(2,2,2)
		part.Position = waypoint.Position
		part.Parent = workspace
		local Debris = game:GetService("Debris")
		Debris:AddItem(part, 1)
		part.Material = Enum.Material.Neon
		part.Shape = Enum.PartType.Ball
	end
end


local function See_Players(target)
	if target and target:FindFirstChild("HumanoidRootPart") then
		local origin = AI.HumanoidRootPart.Position
		local direction = (target.HumanoidRootPart.Position - AI.HumanoidRootPart.Position).unit * 100000
		local ray = Ray.new(origin, direction)
		local ignoreList = {AI}
		script.Parent.HumanoidRootPart:SetNetworkOwner(nil)
		local hit, pos = workspace:FindPartOnRayWithIgnoreList(ray, ignoreList)

		-- check if it exists
		if hit then
			-- check if it hit
			if hit:IsDescendantOf(target) then
				-- check health
				if target.Humanoid.Health > 0 then
					-- check if target is safe or not

					if  target.Safe.Value == false then
						-- check if monster can see
						local unit = (target.HumanoidRootPart.Position - getHumPos()).Unit
						local lv = AI.HumanoidRootPart.CFrame.LookVector
						local dp = unit:Dot(lv)
	
						if dp > 0 then
							return true
						end		
					end			
				end
			end
		else
			return false
		end	
	end
end

local function Move_To_Block()
	if Runing == false then
		local Player = FindPotentialPlayer()
		if Foot == false then
			if Sacer == false then
				if Player ~= nil then
					if script.Parent.Configurations.LoopPointsFolder.Value ~= nil then
						local goal = script.Parent.Configurations.LoopPointsFolder.Value:GetChildren()[Random.new():NextInteger(1,#script.Parent.Configurations.LoopPointsFolder.Value:GetChildren())]
						local Part_LoopPoints = PathfindingService:CreatePath()
						Part_LoopPoints:ComputeAsync(AI.HumanoidRootPart.Position,goal.Position)
						if SETTINGS.See_Path == true then
							displayPath(Part_LoopPoints:GetWaypoints())
						end
						for i,LoopPoints in ipairs(Part_LoopPoints:GetWaypoints()) do
							if Player then
								if See_Players(Player.Character) then
									break
								end
							end
							if Player.Character:FindFirstChild("Humanoid").MoveDirection.Magnitude > 0 then
								if  Player.Character.Safe.Value == false then
									if (Player.Character.HumanoidRootPart.Position - AI.HumanoidRootPart.Position).Magnitude < SETTINGS.Max_distance_Listens_To_Foot_Sounds then
										if Player.Character.Sound_.Value == 3 or Player.Character.Sound_.Value > 3 then
											local Foot_Fineing = PathfindingService:CreatePath()
											Foot_Fineing:ComputeAsync(AI.HumanoidRootPart.Position , Player.Character.HumanoidRootPart.Position)
											for i,v in ipairs(Foot_Fineing:GetWaypoints()) do
												if FindPotentialPlayer() and See_Players(FindPotentialPlayer().Character) and FindPotentialPlayer().Character.Humanoid.Health > 0 and Sacer == false then
													Foot = true
													break 
												else
													AI.Humanoid:MoveTo(v.Position)
													AI.Humanoid.MoveToFinished:Wait()
												end
											end
										end
									end
								end
							end
							if Foot == true then
								break
							end
							if Player and See_Players(Player.Character) and Player.Character.Humanoid.Health > 0 and Sacer == false then
								break 
							end
							if Player then
								if See_Players(Player.Character) then
									break
								end
							end
							if SETTINGS.Sound_Chase ~= nil then
								SETTINGS.Sound_Chase.Playing = false
							end
							AI.Humanoid:MoveTo(LoopPoints.Position)
							AI.Humanoid.MoveToFinished:Wait()
						end
					else
						error("AI Error Not LoopPoints in workspace")
					end
				end
			else

				print("Not Character Players")
			end
		end
	end
end
TP.Event:Connect(function()
	Runing = false
end)
--local Kill_Box = script.Parent.PrimaryPart
--Kill_Box.Touched:Connect(function(hit)
--	if game.Players:FindFirstChild(hit.Parent.Name) ~= nil then
--		if hit.Parent:FindFirstChild("Humanoid").Health ~= 0 then
--			Sacer = true
--			local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
--			script.Parent.Sacer:Fire(SETTINGS.Jump_Sacer_Time)
--			game:GetService("ReplicatedStorage"):WaitForChild("Sacer"):FireClient(plr,AI,SETTINGS.Jump_Sacer_Time)
--			hit.Parent:FindFirstChild("Humanoid").Health = 0
--			wait(SETTINGS.Jump_Sacer_Time)
--			Sacer = false
--		end
--	end
--end)
for i,Safe_Zone in pairs(Safe_Zone_) do
	Safe_Zone.Touched:Connect(function(hit)
		if game.Players:FindFirstChild(hit.Parent.Name) ~= nil then
			hit.Parent.Safe.Value = true
		end
	end)

	Safe_Zone.TouchEnded:Connect(function(hit)
		if game.Players:FindFirstChild(hit.Parent.Name) ~= nil then
			hit.Parent.Safe.Value = false
		end
	end)
end

local function Chase_Player(Path)
	Runing = true
	local Player_For_Chase = FindPotentialPlayer()
	local hrp:BasePart = Player_For_Chase.Character.HumanoidRootPart
	Path:Run(hrp.Position + (hrp.AssemblyLinearVelocity/3))
	TargetedEvent:FireClient(Player_For_Chase,true)
	if Player_For_Chase.Character.Safe.Value == true then
		Path:Stop()
		wait(0.07)
		local path_ = PathfindingService:CreatePath()
		path_:ComputeAsync(AI.HumanoidRootPart.Position, Player_For_Chase.Character.HumanoidRootPart.Position)
		for i,Path_Walk in ipairs(path_:GetWaypoints()) do
			AI.Humanoid:MoveTo(Path_Walk.Position)

			if Player_For_Chase.Character.Safe.Value == false then
				break
			end
			AI.Humanoid.MoveToFinished:Wait()
		end
		if Player_For_Chase.Character.Safe.Value == false then
			return;
		end
		TargetedEvent:FireClient(Player_For_Chase,false)
		Runing = false
	end
	if Player_For_Chase.Character.Humanoid.Health == 0 then
		Runing = false

	end
end

while true do
	local Player = FindPotentialPlayer()
	if Player and See_Players(Player.Character) and Player.Character.Humanoid.Health > 0 and Sacer == false or Foot == true then
		local Path = _Path.new(AI)
		if SETTINGS.See_Path == true then
			Path.Visualize = true
		end
		if laughon == true then
			if chaselaugh:IsA("Sound") then
				chaselaugh:Play()
			else
				print("ChaseLaugh its not a Audio! Change the values")
			end
		end
		repeat
			if SETTINGS.Sound_Chase ~= nil then
				SETTINGS.Sound_Chase.Playing = true
			end
			Foot = false
			AI.Humanoid.WalkSpeed = Speed.Speed_Run
			TargetedEvent:FireClient(Player,true)
			Chase_Player(Path)
		until Path == nil or Runing == false or Player.Character.Humanoid.Health == 0 or (Player.Character.HumanoidRootPart.Position - AI.HumanoidRootPart.Position).Magnitude > SETTINGS.Max_distance_Chase
		AI.Humanoid.WalkSpeed = Speed.Speed_Walk
		Path:Stop()
		for i, v in pairs(game.Players:GetPlayers()) do
			TargetedEvent:FireClient(v,false)
		end
		Runing = false
		Move_To_Block()
		Path = nil
	else
		AI.Humanoid.WalkSpeed = Speed.Speed_Walk
		Move_To_Block()
		AI.Humanoid.WalkSpeed = Speed.Speed_Walk
	end
	game:GetService("RunService").Heartbeat:Wait()
end

return AI;
#2

You tried to use the method “:IsA” on an object that does not exist. Check if “Workspace.GameAI.AI.AI” is destroyed by something.

#3

The error doesn’t mean GameAI.AI.AI is nil, that is the script and at line 256 in that script he is doing nil:IsA() somewhere.

#4

Yeah, you are right, It is pretty late for me.
I took a look at his script at line 38 “chaselaugh = script.Parent.Configurations.ChaseLaugh.LaughLocation.Value”

#6

I see that, but what are you suggesting?

#7

There is only a single line where IsA() is being called and it is here, on line 256, just like the error is telling you.

if chaselaugh:IsA("Sound") then

This indicates that chaselaugh does not exist, i.e. is nil. I have no idea what or where the instance of chaselaugh is, so maybe change this line to check if it exists before using it:

if chaselaugh and chaselaugh:IsA("Sound") then

The code is really badly written, it is full of concatenated function calls with no checks on return values or the ability to accommodate replication issues. It has huge logic trees with up to seven indentations of if/else/end. And so many long instance paths that it becomes painful to read, fathom, and debug. If this is a quick and dirty test bed for some cleaner code to be written at a later date, then forget what I have said, but if this is actually entering any sort of release/production it has too many issues to be written here, I would sound like a mad man listing them all!

1 Like
#8

Since you are checking if the value of LaughLocation is a sound, I’m assuming that laugh location is an object value. You probably have set the value of the “LaughLocation” object value to nil aka “nothing”

#9

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