So, regarding on this topic:
I thought it would be good to make a Bug report.
What does happen: Game crash after pressing ESC
When does it happen: while ingame downloading Stream Files of a car
How to reproduce: go to settings in FiveM and enable the new download option, to see when something is downloading ingame. Start a server with several addon cars, spawn a car and Press ESC while it Shows that It’s downloading.
As soon the download is done it won’t crash anymore.
I hope that get’s fixed soon, If someone need more information write below.
Have a nice day 
