LocalScript replication is broken - game is unplayable

Bug Reports Engine Bugs
#1

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image1031×1218 477 KB

Join the game, you never spawn in or anything. Check the dev console client view and you get this stack trace. Starting happening today.

UPDATE: The error is unrelated to the broken game. The game broke because LocalScripts are no longer copied from StarterGui into PlayerGui. Writing a simple patch completely fixed the problem:

local contents = game.StarterGui:GetChildren()
for i, v in next, contents do
    v.Parent = nil
end

game.Players.PlayerAdded:Connect(function(player)
    for i, v in next, contents do
        v:Clone().Parent = player:WaitForChild'PlayerGui'
    end
end)
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CoreGui PlayerRelationship module error
#2

One of the players for my games reported the same issue. This should be looked into

Edit: adding a few précisions.

The player who reported it to me sent me a screenshot containing the same error stack. It was also today.

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#3

Other games seem fine:

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image1355×293 337 KB

So if this breaks gameplay, then that seems game-specific, other games are apparently handling the error gracefully. Make sure to follow How to post a Bug Report in the future (not even a game link is mentioned in this post as-is).

#4

Well my game is suffering from this also. It causes ping to spike to 500+ making the game unplayable. None of the scripts break, it just makes the game unplayable due to the lag it causes.

Game link: [ Content Deleted ] - Roblox

Console:
https://gyazo.com/6c7edded513861783f6a2c5269f98c96

Do notice the scroll bar on the right side and how tiny it is, because the console is just spammed with these messages.

When I join a fresh server I have on average 80 - 110 ping. but after about 20 mins it goes to anywhere between these ranges 200 - 400, 500 - 700 and 800 - 1000. Rejoining the server doesn’t fix the problem as the console gets spammed right away with the errors when you rejoin.

From the stack trace I would assume its the playerlist core script? I know its nothing I have done.

#5

Added an update to the OP with more information

#6

I am experiencing the same issue as seen:

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image1050×689 584 KB

However this doesn’t appear to be fatally breaking my game, there is just about 20 errors that all look just about identical to the one I posted. Something is obviously going on with CoreScripts from a recent update roblox made, as I don’t recall seeing this in any of my places as of about 3 weeks ago. Hope this bug gets fixed soon. Looks related to the Leaderboard and leaderstats.

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#7

This is happening also to me. But many games are fine

#8

I don’t know if the issue has been resolved but I’m able to join the game without any issues (120 people are playing also)

:hearts:

#9

Any update on this? I’ve been getting these errors on my client side for a few days now. It’s not breaking anything, but I think it’s causing a bit of lag on my end. Screenshot by Lightshot

#10

@Sharksie Would you mind updating the post title as it is a bit misleading?

On another note I am also still experiencing these Corescript errors as well. Anyone have any ideas as Surgo said on when we can expect a fix?

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#11

Those corescript errors are due to the Roblox playerlist unable to handle unconventional/subpar leaderstat manipulation by the game and does not affect the game itself.
Also, standalone LocalScripts which reset on spawn should be placed into StartCharacterScripts instead of StarterGui.

#12

Can you give an example of unconventional / subpar leaderstat manipulation?

Because as far as I know it’s just value objects in a folder, don’t understand how it’s possible to do a subpar manipulation of such a value.

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#13

In this case it looks like the leaderstats folder wasnt added straight away or was reparented for whatever reason.
You should always, with the PlayerAdded event and no yielding before/during,

  1. Create the folder and value instances and set their properties
  2. Parent the values to the folder
  3. Parent the folder to the Player
#14

Repro steps, working on version 0.434.0.405736 in Studio and in-game

  1. Create a Baseplate place
  2. Add a server script to ServerScriptService and insert the following code:
local PlayersService = game:GetService("Players")

PlayersService.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	
	local stat = Instance.new("IntValue")
	stat.Name = "Test Stat"
	stat.Parent = leaderstats
	
	leaderstats.Parent = player	
end)
  1. Test with two clients in studio, or publish and then test with two clients in-game
  2. Once both have connected, make either one of the clients leave/disconnect
  3. Observe the error messages in the remaining client’s output/console:
[...]
- CoreGui [...] PlayerEntry:361: attempt to index nil with 'Test Stat'
[...]

Repro file:
repro.rbxl (18.2 KB)

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