# UI Widget Blueprint got corrupted - crashes UEFN and prevents session to load **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** id, slug, closed, name\ **Created:** [November 23, 2025, 10:02pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911 "2025-11-23T22:02:25Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![MartialST1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MartialST1](https://forums.unrealengine.com/u/MartialST1)\ **Post date:** [November 23, 2025, 10:02pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/1 "2025-11-23T22:02:26Z")
### 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](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/f/8/af84cf9431c45a43a202f865cc294ed9cae509bd.png) ### Additional Notes the image is where the loading stops when the crash happens ---
**Author:** ![MartialST1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MartialST1](https://forums.unrealengine.com/u/MartialST1)\ **Post date:** [November 26, 2025, 6:27pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/2 "2025-11-26T18:27:22Z")
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). ---
**Author:** ![YF\_HT](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@YF\_HT](https://forums.unrealengine.com/u/YF_HT)\ **Post date:** [December 14, 2025, 11:37am UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/3 "2025-12-14T11:37:05Z")
did you find a solution yet,i am experiencing the same problem ---
**Author:** ![MartialST1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MartialST1](https://forums.unrealengine.com/u/MartialST1)\ **Post date:** [December 17, 2025, 7:12pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/4 "2025-12-17T19:12:56Z")
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 ---
**Author:** ![YF\_HT](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@YF\_HT](https://forums.unrealengine.com/u/YF_HT)\ **Post date:** [December 18, 2025, 11:24am UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/5 "2025-12-18T11:24:52Z")
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 ---
**Author:** ![Hexagon37](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hexagon37](https://forums.unrealengine.com/u/Hexagon37)\ **Post date:** [February 16, 2026, 10:49pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/6 "2026-02-16T22:49:12Z")
Having this issue, definitely need a fix without remaking it… ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [February 26, 2026, 3:08pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/8 "2026-02-26T15:08:05Z")
Could someone send over their island code or project ID so we can take a look? ---
**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\ **Post date:** [March 2, 2026, 8:00pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/9 "2026-03-02T20:00:45Z")
FORT-1057376 has been ‘Closed’ as a duplicate of an existing known issue. Origin Issue: FORT-1057375, Origin Topic: [ui widget blueprint crashing uefn](https://forums.unrealengine.com/t/ui-widget-blueprint-crashing-uefn/2684925) ---
**Author:** ![Hexagon37](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hexagon37](https://forums.unrealengine.com/u/Hexagon37)\ **Post date:** [March 4, 2026, 12:22am UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/10 "2026-03-04T00:22:39Z")
Im not sure where to get the project ID (i dont have it published) how do i get that? ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [March 10, 2026, 12:53pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/11 "2026-03-10T12:53:37Z")
Hi @Hexagon37 On Creator Portal, the URL of your island should have the project ID. ---
**Author:** ![Hexagon37](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hexagon37](https://forums.unrealengine.com/u/Hexagon37)\ **Post date:** [March 11, 2026, 4:03am UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/12 "2026-03-11T04:03:42Z")
Hello! Here is what I am assuming is the project ID: fbbe7630-4f08-6791-365a-c6a4415dd335 The widgets in question experiencing this issue are any of the ones named “MainMenu”, “MainMenu\_Broken” is the original instance of the widget Looking forward to this issue being fixed! I spent 4 months on this widget and don’t have a backup due to an earlier issue with revision control locking me out of my project, so I’m mortified of potentially losing it. ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [March 26, 2026, 10:02am UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/13 "2026-03-26T10:02:25Z")
Thank you, @Hexagon37 🙂 ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [March 26, 2026, 1:53pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/14 "2026-03-26T13:53:25Z")
@Hexagon37 Could we get your editor logs please? > [@How to get your Fortnite logs](https://forums.unrealengine.com/t/how-to-get-your-fortnite-logs/682382): > > At times, we will ask you to send us your logs when you’re having an issue in UEFN. Here is how to do that: UEFN Logs Exit Fortnite. Click on Start or press the Windows Key + R. Type \AppData\Local\UnrealEditorFortnite\Saved\Logs and press Enter. Zip your Logs folder and attach the zip file to your reply. To find UEFN Logs while working in UEFN: Click “Output Log” at the bottom of the window. Click on “Setting” at the top right of the window Click “Open Source Location” Zip your Logs folder… ---
**Author:** ![Hexagon37](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hexagon37](https://forums.unrealengine.com/u/Hexagon37)\ **Post date:** [April 1, 2026, 10:50pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/15 "2026-04-01T22:50:26Z")
Here are my logs! [Logs.zip](https://forums.unrealengine.com/uploads/short-url/7NKTWtev2Jst0LrqnT96OxttFLi.zip) (1.7 MB) ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [April 15, 2026, 10:32am UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/16 "2026-04-15T10:32:07Z")
Thank you! ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [May 22, 2026, 10:03pm UTC](https://forums.unrealengine.com/t/ui-widget-blueprint-got-corrupted-crashes-uefn-and-prevents-session-to-load/2677911/17 "2026-05-22T22:03:19Z")
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