Fatal Error Causing Game Crash

[LuxyCeremy]

1. When there is a game over, every peer disconnected.
2. I try to start a new game, and this error occured. Game is frozen and later it crashed.
   And in the log:

USER ERROR: FATAL: Condition "!exists" is true.
   at: godot::HashMap<unsigned __int64,class godot::Ref<class SteamConnection>,struct godot::HashMapHasherDefault,struct godot::HashMapComparatorDefault<unsigned __int64>,class godot::DefaultTypedAllocator<struct godot::HashMapElement<unsigned __int64,class godot::Ref<class SteamConnection> > > >::operator [] (godot-cpp\include\godot_cpp/templates/hash_map.hpp:502)