Steps to repro:

1. Open attached project;
2. Go to Assets -> SampleScenes -> Scenes;
3. Open 'Car' scene;
4. Select any gameobject in the Hierarchy;
5. Launch the scene;
6. Close Editor.

Actual result:
Editor crashes.

"Runtime error!
R6025 - pure virtual function call"

is thrown. See attached gif video.
Regression introduced in 5.5.0b11.

Notes:
- Reproducible in 5.5.0b11, 5.6.0a2;
- Not reproducible in 5.5.0b10;
- Reproducible on Windows 10 and OSX 10.12.1;
- Not reproducible when gameobject is not selected;
- Not reproducible when just closing Editor not being in Play mode;
- Not reproducible in the new project/bug seems to be project-specific.