EDIT: This issue has been fixed in the latest update (Version 39).
We have identified a rare issue that occurs when using Shadereave or Marie-Therese in Starfall Circus. This bug occurs when Shadereave's Draugrs or Marie-Therese's zombies die due to damage from a level property. We are working hard to release a fix for this.
Our apologies for any inconvenience caused by this.