Mass entity AI crash

Hi!

For an unknow reason, UE5.6 crashes with data assets

Here is the mass component in the bp AI :

When i launch my level all work until mass AI tries to spawn. Crash in editor, freeze in shipping game.

I already tried different data assets and different character BP.. crash. I can’t even open my level, EXCEPT if i remove the data asset from the AI BP. Then it can be open but crash when simulated.

Heres the state tree :

At this point i dunno. Heres the mass plugin :

Oh, and the character mass works alone. But i want my data asset >:(

Crash message :

LoginId:1b2c24b340f81f7032b2e690ba48e30f
EpicAccountId:3897ddbcc387408bacd7e7a6cc463716

Assertion failed: Pair != nullptr [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Map.h] [Line: 729]

UnrealEditor_Core
UnrealEditor_MassEntity
UnrealEditor_MassEntity
UnrealEditor_MassSpawner
UnrealEditor_MassSpawner
UnrealEditor_MassActors
UnrealEditor_MassActors
UnrealEditor_MassEntity
UnrealEditor_MassEntity
UnrealEditor_Engine
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

I think its because the mass actor fragment is greyed like i can’t choose an actor but im not sure.

Thank you :slight_smile:

It was because I had the wrong data asset with two other BP AI that I forgot.