UI Widget Blueprint got corrupted - crashes UEFN and prevents session to load

MartialST1
Sun, 23 Nov 2025 22:02:25 +0000
Issues and Bug Reporting

Summary

When opening the widget to edit, UEFN crashes.
It happened after I added bindings and conditions to the widget, it had around 20 total. The conditions have int variables, the bindings have message variables.

When I launch session, it also throws an error and returns me to the creative hub. The error says there are invalid conditions in that widget.

ArenaUI.uasset: [Compiler] Internal error: A condition is invalid.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

1. Create a widget.

2. Add conditions(?)

3. Launch session or restart UEFN and open a widget to edit

Expected Result

Widget opens without errors. Game runs.

Observed Result

Opening the widget crashes the UEFN client. Game session doesn’t load and throw errors.

Platform(s)

windows

Upload an image

Additional Notes

the image is where the loading stops when the crash happens

15 posts - 5 participants