5.7 UEFN Error 0xffffffffffffffff

Development Getting Started & Setup
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I’ve been working on my map for about two months without any issues. However, right after updating to UEFN 5.7, I suddenly started getting this error:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

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kernel32
ntdll

It happens when I try to open the project or sometimes during cooking. I’ve already tried a lot of things:

  • Removed all fog and atmospheric effects (since I saw people mention fog might cause it)

  • Undid my recent changes

  • Verified the installation through Epic Games Launcher

Unfortunately, the crash still happens. The project worked perfectly fine before the update, and now it crashes every time even though I didn’t change anything major.

If anyone has encountered this after updating to 5.7 or knows what might cause it (bad reference, broken struct, plugin issue, etc.), I’d really appreciate your help.

Thanks in advance!