nav_generate crashes the moment it's done

When I try to generate a navmesh, it’s always crashing the very moment it’s done (saved to map graphs). I can just use nav_generate_incremental, but that’s not addressing the core problem.

Here’s a mdmp from one of my attempts to nav_generate:
http://dumps.metastruct.uk.to/dumper.py?dump=hl2_140419_crash_2014_6_14T13_52_38C0.mdmp

(And I still get a working (so far) nav mesh if I do nav_quicksave 0, so why crash?)

Make sure graphics drivers are up to date, verify integrity of game cache

If that does not work, try this.

  1. Open steam
  2. Go to library
  3. Right click Gmod
  4. Go to Properties
  5. Go to ‘Set lanch options’
  6. Type in the command
  7. Click done
  8. If that does not work and keep crashing your game,
    follow the guide above but remove the command