Crash on connect

I wanted to test how well the fps.sample runs on my pc using the build provided here: https://forum.unity.com/threads/how-can-we-download-the-fps-sample-build.573505/
before downloading the github project.

Had some problems starting the server from inside the game (no server output whatsoever), so I had to start up a command line as administrator and execute server.bat manually (with no arguments).
This seems to have worked.

Now, inside the game, just after connecting to the default IP the game crashes. The Unity Crash Handler starts up but after that the game just freezes.

Any known causes this could have?

Edit: These are the last few lines from the console that seem relevant

Code (CSharp):

1. 4280: Spawned character:Robot_Server (UnityEngine.GameObject)_PlayerState(Clone)
2. _49
3. 4280: [ERR] Update tick invalid. Game tick:4408 but current state is at tick:0
4. 4842: Client 0 is ready
5. 6657: Client 0 disconnected
6. 6657: Last package sent : 287 . Last package received 26 30021 ms ago

 

Could you solve it? I have a similar problem (Update tick invalid. Game tick:2 but current state is at tick:0)