Hi,
I’m on UE4.27.2 (source build). I have a dedicated server setup and a level made with World Compositor. When I connect to the dedicated server with the client, I sometimes get the following error which crashes the game immediately when the client starts loading the persistent level/when the client’s player controller is created.
This happens rarely and seems to happen randomly. It’ll usually happen once every 20/30 times when I connect.
Fatal error: [File:L:/UE4.27.2-Source/Engine/Source/Runtime/CoreUObject/Private/Serialization/AsyncLoading.cpp] [Line: 5291]
Invalid object in Async Objects Referencer
It seems to be trying to load something when the persistent level is loaded. Has anyone ever encountered this before?
Thanks 
hey, having a similar problem
LowLevelFatalError [File:Unknown] [Line: 5291] Invalid object in Async Objects Referencer
i cant find anything on it for the life of me
my current fix is just hoping it dosen’t happen
hope this gets fixed soon
I found that the error occurs when changing maps, leading me to believe that something stored in the memory from the previous map is still trying to be accessed by the garbage collector even after the map has been unloaded, hence the error.
I have added a ‘flush level streaming’ node to the ‘begin play’ event of each map and that fixed the issue.

@Betaboycreatorye
I found that the error occurs when changing maps, leading me to believe that something stored in the memory from the previous map is still trying to be accessed by the garbage collector even after the map has been unloaded, hence the error.
I have added a ‘flush level streaming’ node to the ‘begin play’ event of each map and that fixed the issue.

i tried that. It didn’t help. Ever since I made the change it has only gotten worse. I can’t open the game at all without it lagging and then crashing with the same error.
Sounds like you have some kind of other problem in your game. Time to revert to a backup I guess. 