Seamless travel Crash

When I try to connect 2 players (Standalone) with seamless, both clients crash if there is an object that calls “Cast To CustomCharacter”.

Even if I just place an empty actor to the level clients will travel to, and the whole actors logic consists of:

both players still crashes.

I’m new to Unreal Engine and debugging for me is still quite difficult, I tried to look around crash logs and these were the files that included where the errors occured but I have no idea how I could fix those issues…

Crash logs: ****************************************LOG 01****************************** -

The only thing I’m able to deduce is that there are some issues with Control Rigs? How is that…