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

General Issues and Bug Reporting
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1

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

Képernyőkép 2025-11-23 194924.png
Képernyőkép 2025-11-23 194924.png614×118 2.85 KB

Additional Notes

the image is where the loading stops when the crash happens

2

Upon further inspection, the cause of the issue could’ve been hooking up the animation property in the condition, and not the Queue function. It shows a warning after compiling the widget (and after reopening could cause the crash).

1 Like
3

did you find a solution yet,i am experiencing the same problem

4

I ended up just remaking the widget.

The cause was likely what I said above – hooking up the animation property in a condition, and not the Queue function

5

oh okey, it verry hard fpor me to remake it it took me so long, i am looking for a way to salvage anything from the broken one