Problem with scale and character

my code was working well , until i change the scale of all

my character now is
type: capsule, dimensions: 0.4 0.4 0, skinwidth:0.01

when i am walking on the terraing , something create a weir problem on the onShapeHit function .
acces violation ,... in

actor = (static_cast<NxActorUserData*>(hit.shape->getActor().userData))->toActor();

what do you thing ?

You have a very small character there, what is it - a cat!?

But try increasing the skin width there.