Crash when disconnecting from dedicated server: Assertion failed: WorldSettings != nullptr

Development Programming & Scripting
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1

I’m having a problem with my dedicated server where fairly frequently players on clients get a series of log messages like this in their log file.

[2023.08.14-04.24.09:188][587]LogNet: Warning: UActorChannel::ProcessBunch: SerializeNewActor failed to find/spawn actor. Actor: WorldSettings /Game/Maps/TowerAreas/TowerZero/_Generated_/TowerZero_MainGrid_L0_X0_Y1.TowerZero:PersistentLevel.WorldSettings, Channel: 32 [2023.08.14-04.24.10:456][688]LogNet: Warning: UActorChannel::ProcessBunch: SerializeNewActor failed to find/spawn actor. Actor: WorldSettings /Game/Maps/TowerAreas/TowerZero/_Generated_/TowerZero_MainGrid_L0_X0_Y1.TowerZero:PersistentLevel.WorldSettings, Channel: 32 [2023.08.14-04.24.17:163][215]LogNet: Warning: UActorChannel::ProcessBunch: SerializeNewActor failed to find/spawn actor. Actor: WorldSettings

The “channel” varies it just happened to be 32 both times in the snippet above. Occassionally I see the same message with other actors but 9 times out of 10 its world settings that fails. Sometimes these errors are repeated 5 or 10 times, usually within a few seconds of each other. When that happens, game play continues without a problem until they try to disconnect from the server and return to the main menu but at that point the players client crashes with this error:

[2023.08.14-04.29.18:104][551]LogWindows: Error: appError called: Assertion failed: WorldSettings != nullptr [File:C:\Users\XXX\Documents\UnrealEngine\Engine\Source\Runtime\Engine\Private\Level.cpp] [Line: 3115]

If anyone has any idea how to debug this I’d be incredibly greatful for some insight, I’ve been banging my head against a wall on it and its really hurting the player experience :/. I’m not at all familiar with the world settings actor and how it relates to exiting a session. It seems to come near the end of the tear down process.

1 Like
3

Hi, I met the same proble. And I find another issue about this.
Is there any method to reslove it?

4

The problem just seemed to disappear at some point and I never determined what was causing it unfortunately.

5

It seems Unreal 5.2.0 fix this crash. It only happens on 5.1.x, with streaming world partition sublevels.

6

I’m also encountering the same error with around a 30~40% chance when clients transition from the server to the main menu in version 5.2.1. Is using “open level” to navigate to the main menu the problem? Or is it just a simple engine bug? It seems related to WorldPartition, but I’m not sure how to resolve it.

7

i have it consistently on 5.2 but only when traveling from a certain map. which is an important map to travel from.

in my tests it seems that it’s related to having sublevels loaded. (and even after i’ve unloaded them).