Attempt to index nil with HumanoidRootPart

Brockanthony10 · January 8, 2023, 7:14am

I am scripting an AI that uses smart pathfinding until it gets so close but when it finally kills the plyer this error occurs,

I understand why it’s saying it but all my solutions don’t seem to work

local pathFindingService = game:GetService("PathfindingService")
local goal = nil


local humRootPart = script.Parent.HumanoidRootPart
local hum = script.Parent.Humanoid


local function findTarget()
	local closestPlayer
	local closestChar
	local closestDistance = math.huge
	for i, v in pairs(game.Players:GetPlayers()) do
		local char = v.Character or v.CharacterAdded:Wait(.5)
		local hum = char.Humanoid
		if char and hum.Health > 0 then
			local dist = (humRootPart.Position - char.HumanoidRootPart.Position).Magnitude
			if (dist <= closestDistance) then
				closestPlayer = v
				closestDistance = dist
				closestChar = v.Character or v.CharacterAdded:Wait()
			end
		end
	end
	return closestChar
end

local function canSeePlayer()
	local target = findTarget()
	local params = RaycastParams.new()
	params.FilterDescendantsInstances = {script.Parent}
	
	params.FilterType = Enum.RaycastFilterType.Blacklist
	local hit, pos = workspace:Raycast(humRootPart.Position, target.HumanoidRootPart.Position - humRootPart.Position, params)
	
	if hit ~= nil and hit.Instance.Parent == target.HumanoidRootPart.Parent then
		return true
	end
end

local function moveToClosestPlayer()
	local seePlayer = canSeePlayer()
	local target = findTarget()
	local path = pathFindingService:CreatePath()
	path:ComputeAsync(humRootPart.Position, target.HumanoidRootPart.Position)
	local waypoints = path:GetWaypoints()
	if seePlayer == true then
		for i, v in pairs(waypoints) do
			if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > 15  and target.Humanoid.Health > 0 then
				if v.Action == Enum.PathWaypointAction.Jump then
					hum.Jump = true
				end
				hum:MoveTo(v.Position)
					hum.MoveToFinished:Wait()
			else
				if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > .5 and target.Humanoid.Health > 0 then
					local attackAnim = script.Parent.Hatchet.AttackAnimation
					local attackAnimPlay = hum:LoadAnimation(attackAnim)
					attackAnimPlay:Play()
					script.Parent.Hatchet.Handle.Touched:Connect(function(hit)
						if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent ~= script.Parent then
							local humHit = hit.Parent:FindFirstChild("Humanoid")
							humHit.Health -= 25
							wait(3)
						end
					end)
					wait(1)
				end
				if target.Humanoid.Health > 0  then
					hum:MoveTo(target.HumanoidRootPart.Position)
				end
			end
		end
	end
end

wait(5)

for i, v in pairs(script.Parent:GetChildren()) do
	if v:IsA("Part") then
		v:SetNetworkOwner()
	end
end

while true do
	moveToClosestPlayer()
end

Deadlox85854868 · January 8, 2023, 7:22am

Try this:

local pathFindingService = game:GetService("PathfindingService")
local goal = nil


local humRootPart = script.Parent.HumanoidRootPart
local hum = script.Parent.Humanoid


local function findTarget()
	local closestPlayer
	local closestChar
	local closestDistance = math.huge
	for i, v in pairs(game.Players:GetPlayers()) do
		local char = v.Character or v.CharacterAdded:Wait(.5)
		local human = char.Humanoid
		if char and human.Health > 0 then
			local dist = (humRootPart.Position - char.HumanoidRootPart.Position).Magnitude
			if (dist <= closestDistance) then
				closestPlayer = v
				closestDistance = dist
				closestChar = v.Character or v.CharacterAdded:Wait()
			end
		end
	end
	return closestChar
end

local function canSeePlayer(target)
	local origin = humRootPart.Position
	local direction = (target.HumanoidRootPart.Position - humRootPart.Position).unit * 40
	local ray = Ray.new(origin, direction)

	local hit, pos = workspace:FindPartOnRay(ray, hum.Parent)

	if hit then
		if hit:IsDescendantOf(target) then
			return true
		end
	else
		return false
	end
end

local function moveToClosestPlayer()
	local seePlayer = canSeePlayer()
	local target = findTarget()
	local path = pathFindingService:CreatePath()
	path:ComputeAsync(humRootPart.Position, target.HumanoidRootPart.Position)
	local waypoints = path:GetWaypoints()
	if seePlayer == true then
		for i, v in pairs(waypoints) do
			if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > 15  and target.Humanoid.Health > 0 then
				if v.Action == Enum.PathWaypointAction.Jump then
					hum.Jump = true
				end
				hum:MoveTo(v.Position)
				hum.MoveToFinished:Wait()
			else
				if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > .5 and target.Humanoid.Health > 0 then
					local attackAnim = script.Parent.Hatchet.AttackAnimation
					local attackAnimPlay = hum:LoadAnimation(attackAnim)
					attackAnimPlay:Play()
					script.Parent.Hatchet.Handle.Touched:Connect(function(hit)
						if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent ~= script.Parent then
							local humHit = hit.Parent:FindFirstChild("Humanoid")
							humHit.Health -= 25
							wait(3)
						end
					end)
					wait(1)
				end
				if target.Humanoid.Health > 0  then
					hum:MoveTo(target.HumanoidRootPart.Position)
				end
			end
		end
	end
end

wait(5)

for i, v in pairs(script.Parent:GetChildren()) do
	if v:IsA("Part") then
		v:SetNetworkOwner()
	end
end

while true do
	moveToClosestPlayer()
end

Brockanthony10 · January 8, 2023, 7:25am

same error at line 30

local pathFindingService = game:GetService("PathfindingService")
local goal = nil


local humRootPart = script.Parent.HumanoidRootPart
local hum = script.Parent.Humanoid


local function findTarget()
	local closestPlayer
	local closestChar
	local closestDistance = math.huge
	for i, v in pairs(game.Players:GetPlayers()) do
		local char = v.Character or v.CharacterAdded:Wait(.5)
		local human = char.Humanoid
		if char and human.Health > 0 then
			local dist = (humRootPart.Position - char.HumanoidRootPart.Position).Magnitude
			if (dist <= closestDistance) then
				closestPlayer = v
				closestDistance = dist
				closestChar = v.Character or v.CharacterAdded:Wait()
			end
		end
	end
	return closestChar
end

local function canSeePlayer(target)
	local origin = humRootPart.Position
	local direction = (target.HumanoidRootPart.Position - humRootPart.Position).unit * 40
	local ray = Ray.new(origin, direction)

	local hit, pos = workspace:FindPartOnRay(ray, hum.Parent)

	if hit then
		if hit:IsDescendantOf(target) then
			return true
		end
	else
		return false
	end
end

local function moveToClosestPlayer()
	local seePlayer = canSeePlayer()
	local target = findTarget()
	local path = pathFindingService:CreatePath()
	path:ComputeAsync(humRootPart.Position, target.HumanoidRootPart.Position)
	local waypoints = path:GetWaypoints()
	if seePlayer == true then
		for i, v in pairs(waypoints) do
			if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > 15  and target.Humanoid.Health > 0 then
				if v.Action == Enum.PathWaypointAction.Jump then
					hum.Jump = true
				end
				hum:MoveTo(v.Position)
				hum.MoveToFinished:Wait()
			else
				if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > .5 and target.Humanoid.Health > 0 then
					local attackAnim = script.Parent.Hatchet.AttackAnimation
					local attackAnimPlay = hum:LoadAnimation(attackAnim)
					attackAnimPlay:Play()
					script.Parent.Hatchet.Handle.Touched:Connect(function(hit)
						if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent ~= script.Parent then
							local humHit = hit.Parent:FindFirstChild("Humanoid")
							humHit.Health -= 25
							wait(3)
						end
					end)
					wait(1)
				end
				if target.Humanoid.Health > 0  then
					hum:MoveTo(target.HumanoidRootPart.Position)
				end
			end
		end
	end
end

wait(5)

for i, v in pairs(script.Parent:GetChildren()) do
	if v:IsA("Part") then
		v:SetNetworkOwner()
	end
end

while true do
	moveToClosestPlayer()
end```

BirdieI90 · January 8, 2023, 7:26am

check if it exist

local pathFindingService = game:GetService("PathfindingService")
local goal = nil

local humRootPart = script.Parent:WaitForChild("HumanoidRootPart")
local hum = script.Parent:WaitForChild("Humanoid")

local function findTarget()
	local closestPlayer
	local closestChar
	local closestDistance = math.huge
	for i, v in pairs(game.Players:GetPlayers()) do
		local char = v.Character -- 0.5? wat
		
		if not char or not char:FindFirstChild("Humanoid") or not char:FindFirstChild("HumanoidRootPart") then
			continue
		end

		local hum = char.Humanoid
		if char and hum.Health > 0 then
			local dist = (humRootPart.Position - char.HumanoidRootPart.Position).Magnitude
			if (dist <= closestDistance) then
				closestPlayer = v
				closestDistance = dist
				closestChar = v.Character or v.CharacterAdded:Wait()
			end
		end
	end
	return closestChar
end

local function canSeePlayer()
	local target = findTarget()
	local params = RaycastParams.new()
	params.FilterDescendantsInstances = {script.Parent}

	params.FilterType = Enum.RaycastFilterType.Blacklist
	local hit, pos = workspace:Raycast(humRootPart.Position, target.HumanoidRootPart.Position - humRootPart.Position, params)

	if hit ~= nil and hit.Instance.Parent == target.HumanoidRootPart.Parent then
		return true
	end
end

local function moveToClosestPlayer()
	local seePlayer = canSeePlayer()
	local target = findTarget()
	local path = pathFindingService:CreatePath()
	path:ComputeAsync(humRootPart.Position, target.HumanoidRootPart.Position)
	local waypoints = path:GetWaypoints()
	if seePlayer == true then
		for i, v in pairs(waypoints) do
			if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > 15  and target.Humanoid.Health > 0 then
				if v.Action == Enum.PathWaypointAction.Jump then
					hum.Jump = true
				end
				hum:MoveTo(v.Position)
				hum.MoveToFinished:Wait()
			else
				if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > .5 and target.Humanoid.Health > 0 then
					local attackAnim = script.Parent.Hatchet.AttackAnimation
					local attackAnimPlay = hum:LoadAnimation(attackAnim)
					attackAnimPlay:Play()
					script.Parent.Hatchet.Handle.Touched:Connect(function(hit)
						if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent ~= script.Parent then
							local humHit = hit.Parent:FindFirstChild("Humanoid")
							humHit.Health -= 25
							wait(3)
						end
					end)
					wait(1)
				end
				if target.Humanoid.Health > 0  then
					hum:MoveTo(target.HumanoidRootPart.Position)
				end
			end
		end
	end
end

wait(5)

for i, v in pairs(script.Parent:GetChildren()) do
	if v:IsA("Part") then
		v:SetNetworkOwner()
	end
end

while true do
	moveToClosestPlayer()
end

Brockanthony10 · January 8, 2023, 7:31am

It’s still the same error under the canSeePlayerFunction()

local function canSeePlayer()
	local target = findTarget()
	local params = RaycastParams.new()
	params.FilterDescendantsInstances = {script.Parent}

	params.FilterType = Enum.RaycastFilterType.Blacklist
	local hit, pos = workspace:Raycast(humRootPart.Position, target.HumanoidRootPart.Position - humRootPart.Position, params)

	if hit ~= nil and hit.Instance.Parent == target.HumanoidRootPart.Parent then
		return true
	end
end

if you need to see more context i’m happy to show you cause I’ve tried seeing if it exists and still manage to get the same errors and have checks even if the player is alive and the character exists

Deadlox85854868 · January 8, 2023, 7:33am

Try:

local pathFindingService = game:GetService("PathfindingService")
local goal = nil


local humRootPart = script.Parent.HumanoidRootPart
local hum = script.Parent.Humanoid

local function canSeePlayer(target)
	local origin = humRootPart.Position
	local direction = (target.HumanoidRootPart.Position - humRootPart.Position).unit * 40
	local ray = Ray.new(origin, direction)

	local hit, pos = workspace:FindPartOnRay(ray, hum.Parent)

	if hit then
		if hit:IsDescendantOf(target) then
			return true
		end
	else
		return false
	end
end

local function findTarget()
	local players = game.Players:GetPlayers()
	local maxDistance = 40
	local nearestTarget

	for index, player in pairs(players) do
		if player.Character then
			local target = player.Character
			local distance = (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude
			if distance < maxDistance and canSeePlayer(target) then
				nearestTarget = target
				maxDistance = distance
			end
		end
	end	

	return nearestTarget
end

local function moveToClosestPlayer()
	local seePlayer = canSeePlayer()
	local target = findTarget()
	local path = pathFindingService:CreatePath()
	path:ComputeAsync(humRootPart.Position, target.HumanoidRootPart.Position)
	local waypoints = path:GetWaypoints()
	if seePlayer == true then
		for i, v in pairs(waypoints) do
			if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > 15  and target.Humanoid.Health > 0 then
				if v.Action == Enum.PathWaypointAction.Jump then
					hum.Jump = true
				end
				hum:MoveTo(v.Position)
				hum.MoveToFinished:Wait()
			else
				if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > .5 and target.Humanoid.Health > 0 then
					local attackAnim = script.Parent.Hatchet.AttackAnimation
					local attackAnimPlay = hum:LoadAnimation(attackAnim)
					attackAnimPlay:Play()
					script.Parent.Hatchet.Handle.Touched:Connect(function(hit)
						if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent ~= script.Parent then
							local humHit = hit.Parent:FindFirstChild("Humanoid")
							humHit.Health -= 25
							task.wait(3)
						end
					end)
					task.wait(1)
				end
				if target.Humanoid.Health > 0  then
					hum:MoveTo(target.HumanoidRootPart.Position)
				end
			end
		end
	end
end

task.wait(5)

for i, v in pairs(script.Parent:GetChildren()) do
	if v:IsA("Part") then
		v:SetNetworkOwner()
	end
end

while true do
	moveToClosestPlayer()
end

Brockanthony10 · January 8, 2023, 7:37am

Screenshot_340

if you change the order It you don’t know what your target is

BirdieI90 · January 8, 2023, 7:48am

nvm check if the target is not nil which you not did, So it means you are doing nil.HumanoidRootPart.Position

local pathFindingService = game:GetService("PathfindingService")
local goal = nil

local humRootPart = script.Parent:WaitForChild("HumanoidRootPart")
local hum = script.Parent:WaitForChild("Humanoid")

local function findTarget()
	local closestPlayer
	local closestChar
	local closestDistance = math.huge
	for i, v in pairs(game.Players:GetPlayers()) do
		local char = v.Character -- 0.5? wat

		if not char or not char:FindFirstChild("Humanoid") or not char:FindFirstChild("HumanoidRootPart") then
			continue
		end

		local hum = char.Humanoid
		if char and hum.Health > 0 then
			local dist = (humRootPart.Position - char.HumanoidRootPart.Position).Magnitude
			if (dist <= closestDistance) then
				closestPlayer = v
				closestDistance = dist
				closestChar = v.Character or v.CharacterAdded:Wait()
			end
		end
	end
	return closestChar
end

local function canSeePlayer(target)
	local params = RaycastParams.new()
	params.FilterDescendantsInstances = {script.Parent}

	params.FilterType = Enum.RaycastFilterType.Blacklist
	local hit, pos = workspace:Raycast(humRootPart.Position, CFrame.lookAt(humRootPart.Position, target.HumanoidRootPart.Position).LookVector * 300, params)

	if hit ~= nil and hit.Instance.Parent == target.HumanoidRootPart.Parent then
		return true
	end
end

local function moveToClosestPlayer()
	local target = findTarget()
	
	if not target then
		return
	end
	
	local seePlayer = canSeePlayer(target)
	
	local path = pathFindingService:CreatePath()
	path:ComputeAsync(humRootPart.Position, target.HumanoidRootPart.Position)
	local waypoints = path:GetWaypoints()
	if seePlayer == true then
		for i, v in pairs(waypoints) do
			if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > 15  and target.Humanoid.Health > 0 then
				if v.Action == Enum.PathWaypointAction.Jump then
					hum.Jump = true
				end
				hum:MoveTo(v.Position)
				hum.MoveToFinished:Wait()
			else
				if (humRootPart.Position - target.HumanoidRootPart.Position).Magnitude > .5 and target.Humanoid.Health > 0 then
					local attackAnim = script.Parent.Hatchet.AttackAnimation
					local attackAnimPlay = hum:LoadAnimation(attackAnim)
					attackAnimPlay:Play()
					script.Parent.Hatchet.Handle.Touched:Connect(function(hit)
						if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent ~= script.Parent then
							local humHit = hit.Parent:FindFirstChild("Humanoid")
							humHit.Health -= 25
							wait(3)
						end
					end)
					wait(1)
				end
				if target.Humanoid.Health > 0  then
					hum:MoveTo(target.HumanoidRootPart.Position)
				end
			end
		end
	end
end

wait(5)

for i, v in pairs(script.Parent:GetChildren()) do
	if v:IsA("Part") then
		v:SetNetworkOwner()
	end
end

while true do
	moveToClosestPlayer()
end

Brockanthony10 · January 8, 2023, 7:53am

This did crash my game but I was just added a wait() during the findtarget() function

system · January 22, 2023, 7:54am

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.