LoadStreamLevel cause crash on PIE unloading

I’m trying to use LoadStreamLevel to load level asynchronously in background until players are walking from level starting zone to battle zone (screenshot of blueprint is attached to question). I call this code on the server (yeap, maybe I do things in wrong way) to stream levels on all clients.

Pressing of “Escape” button (stopping PIE play) in Editor cause random crash in Garbage Collector calling (I attach callstack to question alt text).

What am I doing wrong?

NOTE: To prevent performance spikes because of long loading iterations during level streaming I’m using “s.LevelStreamingActorsUpdateTimeLimit=0.3”. Maybe it is important.