Reported from our partner Babooblab:
The UDN Customer does not give any detailed information to reproduce the issue. However they specify the kind of issue (stack overwflow) and give a possible solution ("Increasing the stack size to 256K did the trick") with the correspondong code patch file attached. [Link Removed]
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-193461 in the post.