[2021] Can somebody explain me why my game crashed for no reason?

We'll need the files in the folder the error mentions. Unfortunately the Steam discussions aren't suited for this, so I need you to make a post on our official support forums and attach the files there.

https://forum.paradoxplaza.com/forum/forums/support-bug-reports.879/

To find the folder the error mentions, right-click on the game in your Library, select Properties, select the tab Local Files and click the button Browse... That will take you right to where it's found.