Listen server crash in Unload Stream Level node


I’m having some issues with Unload Stream Level blueprint module.

Listen Server is crashing when try to unload some levels only if at least one client is connected. The clients don’t crash.
Those levels don’t seem having nothing different. The Unload instruction can be in the level itself or in another level. Crash anyways.
The next instruction after Unload is executed but only crash when Unload instruction is connected.

What I’m missing, anyone knows?