Unreal Engine 5.4.4 Crashes on startup (Trying to resize TArray to an invalid size)

[RandomSerbian]

Summary

Whenever i try to boot one of my unreal projects up, the loading reaches 93% (Compiling Blueprints), then stays there for a while and then immediately crashes before even getting to the editor.
The main issue seems to be this here:

Script Stack (0 frames) :
[2026.02.23-01.20.52:474][ 0]LogWindows: Error: appError called: Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Containers\ContainerHelpers.cpp] [Line: 8]
Trying to resize TArray to an invalid size of 2147483648
[2026.02.23-01.20.52:474][ 0]LogWindows: Windows GetLastError: The operation completed successfully. (0)

But i’ve attached the log to this as well, along with a crash report image.

If anyone has any suggestions on how to fix this, I’d appreciate it. I really don’t want to have to scrap this project.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

I boot the project up

Expected Result

The editor loads the project

Observed Result

The editor crashes at 93%

Platform(s)

Windows

Upload an image

log.log (516 KB)

[RandomSerbian]

I found the solution!

If you know what uasset isn’t working, all you need to do is go to Saved/Autosaves/[WHATEVER THE DIRECTORY FOR THE PROBLEM UASSET IS] and replace the current one with the autosaved one.

Its a little risky given you’re forced to use an old version where the problem is already forming but at least the game can be loaded again so the problem can be dodged if it happens again.