I have had this happen twice now. Established on localizer to land after 13 hours of flight, and the game just crashes. Super frustrating. Why is this happening?
This was documented in the Support FAQ 19.4 - Please read this before posting! thread.
Please follow the discussion in this thread for more information.
As stated in that thread you can put your camera to ATC, Tower, or Cockpit pointed straight up to help. Others have reported this allowed them to fly.
The fix is currently being tested and the goal is to roll it out at the same time as the 20.1 release.