Project crashes after opening a sequence

Development Cinematics & Media
,
1

I’ve been working on this project for several days and it never crashed, and I also closed it a couple of hours ago without any problems. Now I’ve tried to go back to work but it keeps crashing every time I open the sequence. Crash message:

Assertion failed: GetSystemInstances(ENiagaraSystemInstanceState::Running).Num() == MainDataSet.GetCurrentDataChecked().GetNumInstances() [File:D:\build++UE5\Sync\Engine\Plugins\FX\Niagara\Source\Niagara\Private\NiagaraSystemSimulation.cpp] [Line: 2181]

UnrealEditor_Niagara
UnrealEditor_Niagara
UnrealEditor_Niagara
UnrealEditor_Niagara
UnrealEditor_Niagara
UnrealEditor_Niagara
UnrealEditor_Engine
UnrealEditor_Engine
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

Log message:

[2023.07.20-23.25.37:230][109]LogWindows: Error: appError called: Assertion failed: GetSystemInstances(ENiagaraSystemInstanceState::Running).Num() == MainDataSet.GetCurrentDataChecked().GetNumInstances() [File:D:\build++UE5\Sync\Engine\Plugins\FX\Niagara\Source\Niagara\Private\NiagaraSystemSimulation.cpp] [Line: 2181]

Does anybody know how to fix this? I’ve seen another thread but it had no reply.
Thanks for the help

2

Have you solved the problem?
Otherwise I have the same problem.

3

I found a workaround: if you create a new level sequence and add the sequence that doesn’t work as a shot track you should be able to access it.
If the editor still crashes when opening it from the shot track you can do some animation in the new level sequence and restart the editor, that should do it.