"Create Order" in subscriptions does not create a new order

[esbef]

In demoshop: http://demo.virtocommerce.com/

Subscriptions --> Select an active subscription --> click "Create Order"

No new order for the subscription is generated. Second click on "Create order" leads to Error 500 (see screenshot)

[Tatarincev Eugeney]

Issue moved to VirtoCommerce/vc-module-subscription #23 via ZenHub