UEFN crashes after the update

General Issues and Bug Reporting
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1

Hi everyone, I updated UEFN, and now every time I launch it, it just crashes.
I verified the files, reinstalled UEFN, updated my drivers, and deleted some UEFN saved data.

But it still crashes with the same error:

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CopyEdit

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000001f8f9ff2004

UnrealEditorFortnite_Win64_Shipping  
UnrealEditorFortnite_Win64_Shipping  
kernel32  
ntdll

Any help would be appreciated.

2

Im also having the same issue with the same error code. Ive tried similar workarounds to no avail. let me know if you find something that fixes it!

3

Yes, write,
write here if you find a solution.

4

reinstalled fortnite and uefn and the update came out, this error has not appeared now

before that, of course, I had already reinstalled UEFN.

5

Create a new local Windows account (e.g. “TestUEFN”)

Log in, launch Epic Games Launcher

Try launching UEFN

If it works - it means that your local settings or registry is corrupted.

6

Step-by-step: How to Fix UEFN Crashing on Your Windows User Account

If UEFN crashes right before project selection or immediately on launch — especially after a recent update — and works fine on a different Windows account, your user profile is likely corrupted or contains broken settings/cache.

Follow these steps to clean and reset everything that may be causing the crash:

1. Delete local UEFN and Epic Games cache/config files

On the Windows account where UEFN is crashing:

Delete (or move to your desktop) the following folders:

C:\Users\YourUsername\AppData\Local\UnrealEditorFortnite
C:\Users\YourUsername\AppData\Local\EpicGamesLauncher
C:\Users\YourUsername\AppData\Roaming\Epic
C:\Users\YourUsername\AppData\Roaming\Unreal Engine

:locked_with_key: If you don’t see the AppData folder, paste the path directly into File Explorer.

2. Clean up UEFN-related registry entries

:warning: Caution: Only do this if you’re comfortable using the Windows Registry Editor.

  1. Press Win + R, type regedit, and hit Enter.
  2. Navigate to:
HKEY_CURRENT_USER\Software\Epic Games
HKEY_CURRENT_USER\Software\Unreal Engine
  1. If you see anything related to UnrealEditorFortnite, right-click and delete it.

:white_check_mark: Optional: Right-click → “Export” to back up the key before deleting, just in case.

3. Clear DirectX and shader cache

UEFN relies heavily on shaders, and corrupted shader cache can cause crashes.

Delete this folder:

C:\Users\YourUsername\AppData\Local\D3DSCache

4. Reset permissions on Epic Games folders

Sometimes Epic’s temporary files get incorrect permissions (especially if you ran the launcher as Admin or moved data manually).

  1. Open this folder:
C:\ProgramData\Epic
  1. Right-click > Properties > Security > Edit > Make sure your user account has Full Control

5. Fully reinstall Epic Games Launcher and UEFN (on the crashing account)

  1. Uninstall Epic Games Launcher completely.
  2. Manually delete leftover folders:
C:\Program Files\Epic Games
C:\Users\YourUsername\AppData\Local\EpicGamesLauncher
  1. Download and reinstall the launcher from:
    https://store.epicgames.com/en/download
  2. Reinstall UEFN from the launcher once it’s up.

6. (Optional) Remove or isolate old UEFN projects

Sometimes corrupted files in old projects can crash the editor.

Move old projects out of this folder:

C:\Users\YourUsername\Documents\Unreal Projects\

Start UEFN again with no projects present, and try creating a new one from scratch.

I hope this helps someone because if not the only option left is: reinstalling Windows.

2 Likes
7

hi all,
The developer in another pos found the answer. Clean Boot your PC
[Major] UEFN Won’t Launch after newest patch still- Stuck on “90% Logging In” running for over 10 hours - General / Issues and Bug Reporting - Epic Developer Community Forums

How to perform a clean boot in Windows - Microsoft Support

Something was blocking UEFN

8

I get when launching session fortnite crashes sometimes

9

It was fixed around a week ago, but its back now with the most recent update :expressionless: