@ullreym I can’t get it to crash Blender:

Tried without and with the Vertex Group, Adding the Particle System in Edit and Object Mode… all worked fine.
I think it was Ingmar, who also had crashes…when selecting things with LCS….
I am using a 9 year old Linux machine….
But the Particle System is quite old and maybe it’s a system or OS related bug…( I guess your drivers are up to date?)
Maybe try Geometry Nodes, as it way easier to control and randomize the leaves there.
But if you’ve got a workaround…