Needing help with a error that happens 50/50 of the time

Help and Feedback Scripting Support
1

this is a name script, when u hover over a player, has a text label with there name

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()

local screenGui = script.Parent
local frame = screenGui.TextLabel

local function MoveMouse(...)
	local xDimension = mouse.X
		local yDimension = mouse.Y
		local xResolution = screenGui.AbsoluteSize.X
		local yResolution = screenGui.AbsoluteSize.Y
		local framePosXStart = math.round(xResolution * frame.Position.X.Scale) + frame.Position.X.Offset
		local framePosXEnd = framePosXStart + math.round(xResolution * frame.Size.X.Scale) + frame.Size.X.Offset
		local framePosXMid = math.round((framePosXEnd - framePosXStart)/2)
		local framePosYStart = math.round(yResolution * frame.Position.Y.Scale) + frame.Position.Y.Offset
		local framePosYEnd = framePosYStart + math.round(xResolution * frame.Size.Y.Scale) + frame.Size.Y.Offset
		local framePosYMid = math.round((framePosYEnd - framePosYStart)/2)
	frame.Position = UDim2.new(0, xDimension-framePosXMid, 0, yDimension-framePosYMid)
	
end



wait(3)




while true do
	wait()
	if mouse.Hit.Parent:FindFirstChild("Humanoid") then --check to make sure Mouse.Target is child of a character
		local Character = mouse.Target.Parent
		screenGui.Enabled = true
		frame.Text = mouse.Target.Parent.Name
		mouse.Move:Connect(MoveMouse)
	elseif not mouse.Target.Parent:FindFirstChild("Humanoid") then
		screenGui.Enabled = false
		mouse.Move:Connect(function()
			return
		end)
	end
end

This is working 50% of the time, while the other time it is returning Players.lumbergrim.PlayerGui.ScreenGui.LocalScript:29: attempt to index nil with ‘Parent’

2

script.parent.parent.parent leads to LocalPlayer in your script.

3

this should work

while true do
	task.wait()
	if mouse.Target and mouse.Target.Parent and mouse.Target.Parent:FindFirstChild("Humanoid") then --check to make sure Mouse.Target is child of a character
		local Character = mouse.Target.Parent
		screenGui.Enabled = true
		frame.Text = mouse.Target.Parent.Name
		mouse.Move:Connect(MoveMouse)
	else
		screenGui.Enabled = false
		mouse.Move:Connect(function()
			return
		end)
	end
end
4

Worked, Thanks, also what was causing the issue?

5

sorry for responding so late, what you were doing is not checking if the mouse was actually hitting something (if mouse.Target was actually existent), so sometimes it returned nil.