@Stoon82 I’m not quite sure I understand what you’re attempting to do. That assert is when you pass an empty vertices array to CreateMeshSection since it can’t handle that safely. I need to switch those over to log errors in editor though instead of just assert crashing the engine…
Let me know more what you’re trying to do, or if you can recreate it in a little test project and share that, and I’ll try to figure out why it did that.