This still exists in 4.14, no plugins apart my C++ code. Everything works in standalone. Some more info about the problem in error message instead undefined undefined undefined would be nice. Thanks.
The problem was in my Actor constructor, I started a thread there via singleton which apparently is forbidden, which actually is very good approach. Mea culpa. Moved code to BeginPlay and now everything packages as a charm. By the way, Editor indeed thrown that problem too but at that stage it was just a warning, so check out your logs.
Anyway a stack trace in the error message would be useful 