UEFN crash when opening project since 21.00

Summary

Since 21.00 UEFN has been very unstable, it was crashing occasionally when pushing changes, now it is crashing consistently when trying to open the project.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

  1. Open my UEFN project

Expected Result

Not crash

Observed Result

Crashing

Log callstack: [2026.06.18-21.06.55:577][534]LogOutputDevice: Error: === Handled ensure: ===[ - Pastebin.com

Platform(s)

Windows

Island Code

7142-4719-9129

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Additional Notes

I have the dump file and full log, but I assume you probably won’t want to download random files from me.