Close Widget > Editor Crashes > Assertion Failed Stack. Every. Single. Time

The engine is basically unusable for me at the moment. As the title says, every time I (try to) close a widget in the editor, it crashes. Whether the widget was just created and (literally) untouched/blank, or an existing widget with some text on it… as soon as I close it, crash.

I’ve googled the issue for days now, no joy.

The specific error: Assertion failed: IsValid() [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Templates\SharedPointer.h] [Line: 1074]

Using 5.01

Help please…

@Scatter by Widget, do you mean like a user widget editor or an editor utility widget or perhaps something else

Are you using C++ or blueprints? Does this happen in an already created and somehow edited/transferred project or in a new project? What happens if you verify your UnrealEngine files in the launcher(Unreal tab in EpicGamesLauncher>Arrow next to UE Version>Verify)?

Hey guys, thanks for the responses…

@Zikitamon just a simple user widget in the editor. I was about to create a simple menu to begin testing some variables in my map setup.

@L1z4rD89 Project is C++ (but I haven’t written or modified a single line of code). Brand new project, very early on, haven’t done much - though the issue is specific to this project (I started a new project and the error doesn’t replicate), so it’s a result of a project setting I’ve changed or a plugin I’ve disabled…

Run the verify, no change.